If you’ve ever found yourself overwhelmed by a bounty of fresh zucchini from your garden or the local farmer’s market, zucchini casseroles are the perfect solution. This easy-to-make dish is not only delicious but also versatile, bringing out the best of this often underappreciated vegetable. Whether you’re preparing a side dish for dinner or a main course, zucchini casseroles provide a hearty and comforting option for any meal.
In this article, we’ll explore the best zucchini casserole recipes, guide you through the process of making them, and even share some expert tips to elevate your dish. Ready to turn that pile of zucchini into a family favorite? Let’s get started.

What Makes Zucchini Casseroles So Special?
Zucchini casseroles are incredibly popular for several reasons. First, zucchini itself is mild in flavor, which makes it a perfect base for different ingredients. It pairs wonderfully with cheese, breadcrumbs, and a variety of seasonings. When combined in a casserole, zucchini becomes tender, flavorful, and satisfying. Plus, it’s a great way to sneak in some extra vegetables for picky eaters, especially kids.
Another great thing about zucchini casserole is its flexibility. Whether you want a vegetarian casserole or prefer to add some meat, you can adjust the ingredients to suit your taste. It’s also an excellent dish for meal prep, as it stores and reheats beautifully.
Here are some of the key reasons why zucchini casseroles are a go-to recipe in many kitchens:
• Versatile: Zucchini can be paired with numerous ingredients, making it adaptable to different tastes and dietary preferences.
• Healthy: With zucchini as the star, these casseroles are low in calories but high in fiber, vitamins, and minerals.
• Easy to Make: Whether you’re a seasoned cook or a beginner, preparing a zucchini casserole is straightforward and quick.
• Flavorful: From cheesy to herby, these casseroles are packed with bold flavors that elevate zucchini’s natural taste.
Essential Ingredients for Zucchini Casseroles
Before diving into the recipe, it’s essential to know what goes into a classic zucchini casserole. Here’s a list of key ingredients that you’ll typically find in most zucchini casserole recipes:
• Zucchini – The main star of the dish. Zucchini is shredded or sliced to form the base of the casserole.
• Cheese – Parmesan, cheddar, and mozzarella are the most popular choices. Cheese adds creaminess and depth of flavor.
• Eggs – Eggs serve as a binder, helping to hold the casserole together while also adding protein.
• Breadcrumbs – Panko or regular breadcrumbs add a crispy topping to the casserole, giving it a delightful crunch.
• Heavy Cream or Sour Cream – For a creamy texture, these ingredients enhance the richness of the dish.
• Seasonings – Salt, pepper, garlic, basil, and oregano are some common seasonings used to flavor zucchini casseroles.
These ingredients come together to create the perfect balance of texture and flavor. But, of course, the beauty of zucchini casseroles is that you can customize them to your liking. Let’s explore some variations and pro tips!
Step-by-Step Guide to Making Zucchini Casserole
Making zucchini casserole doesn’t have to be complicated. Follow this simple step-by-step guide to prepare your casserole:
Ingredients:
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9 cups shredded zucchini (about 2.5 pounds)
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1 ½ teaspoons salt
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2 teaspoons olive oil
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1 small yellow onion, finely diced
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3 cloves garlic, minced
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3 large eggs, whisked
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¼ cup heavy cream or sour cream
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1 teaspoon Dijon mustard (optional)
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1 ¼ cups panko breadcrumbs
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1 cup shredded Parmesan cheese
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½ teaspoon each of oregano, basil, garlic salt, and parsley
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¼ teaspoon each of paprika, black pepper
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1 ¼ cups shredded cheddar cheese (for topping)
Topping:
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¼ cup panko breadcrumbs
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1 tablespoon butter, melted

1. Prepare the Zucchini
The first step in making the perfect zucchini casserole is preparing the zucchini. Zucchini contains a lot of moisture, which can result in a soggy casserole. Here’s how to handle it properly:
How to Prepare the Zucchini:
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Shred the zucchini: Grate the zucchini using a box grater or food processor.
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Salt the zucchini: Place the shredded zucchini in a colander, sprinkle with salt, and let it sit for 15 minutes. This step helps draw out excess water.
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Squeeze out excess moisture: After letting the zucchini sit, use a clean kitchen towel or paper towels to press down on the zucchini and absorb the released moisture. This step is essential to avoid a watery casserole.
2. Sauté the Onions and Garlic
While the zucchini is releasing moisture, it’s time to sauté the onions and garlic:
How to Sauté Onions and Garlic:
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Heat olive oil: In a small skillet, heat the olive oil over medium heat.
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Cook the onions: Add the diced onions and sauté for about 5 minutes until they soften and become translucent.
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Add garlic: Add the minced garlic to the pan and cook for an additional 2 minutes until fragrant. Once done, remove from heat and set aside.
3. Combine the Ingredients
Now, it’s time to mix everything together for the casserole filling. Follow these steps:
How to Combine the Ingredients:
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Mix the zucchini: In a large bowl, combine the squeezed zucchini, sautéed onions, garlic, eggs, heavy cream (or sour cream), Dijon mustard (if using), panko breadcrumbs, Parmesan cheese, and seasonings.
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Stir to combine: Use a spatula or wooden spoon to mix everything together until well combined. Make sure the eggs and breadcrumbs are evenly distributed, helping to bind the mixture.
4. Assemble the Casserole
Next, transfer the zucchini mixture to a baking dish:
How to Assemble the Casserole:
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Prepare the dish: Lightly grease a 9×13-inch casserole dish with non-stick spray or butter.
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Fill the dish: Pour the zucchini mixture into the prepared casserole dish. Use a spatula to smooth the top evenly.
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Top with cheese: Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
5. Bake the Casserole
Now it’s time to bake the casserole:
How to Bake the Casserole:
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Cover and bake: Cover the casserole dish with aluminum foil and bake at 375°F for 35 minutes.
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Add the topping: After 35 minutes, mix the melted butter with the remaining ¼ cup of panko breadcrumbs. Sprinkle the mixture evenly over the top of the casserole.
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Bake uncovered: Remove the foil and bake for another 15 minutes, until the top is golden and crispy.
6. Rest and Serve
Let the casserole sit for a few minutes before serving:
How to Rest and Serve:
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Rest the casserole: Allow the casserole to rest for 5 minutes after baking. This gives it time to set and makes it easier to cut into servings.
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Serve: Slice the casserole into squares and serve while warm.
Optional Add-ins:
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Ground Sausage: For a meaty twist, add cooked ground sausage to the casserole mixture.
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Carrots or Mushrooms: Shredded carrots or sautéed mushrooms can be added to enhance the flavor and texture.
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Peppers: Bell peppers can give the casserole a bit of sweetness and extra color.

Pro Tips for the Best Zucchini Casserole
Here are some expert tips to ensure your zucchini casserole turns out perfectly every time:
• Don’t Skip the Salting Step: Salting the zucchini helps remove excess water, preventing a soggy casserole. It also concentrates the flavor.
• Grate Your Own Cheese: For the best flavor and meltability, shred your cheese from a block rather than using pre-shredded cheese.
• Customize the Toppings: Experiment with different toppings like crushed crackers or a mix of cheeses for added texture and flavor.
• Use Fresh Herbs: If possible, use fresh herbs for a more vibrant taste. Fresh basil, parsley, and oregano can elevate your casserole’s flavor.
Zucchini Casserole Variations
One of the best things about zucchini casseroles is how easily they can be customized. Whether you prefer a lighter version or something more indulgent, the options are endless. Below are a few variations you can try to make your zucchini casserole even more exciting and flavorful.
1. Low-Carb Zucchini Casserole
For those following a low-carb or keto diet, zucchini casserole can be adjusted to meet your dietary preferences. Here’s how you can tweak the recipe:
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Use almond flour or coconut flour instead of breadcrumbs for a lower-carb alternative.
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Swap heavy cream with coconut cream for a dairy-free option.
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Add shredded chicken or bacon to increase protein content.
By making these changes, you can enjoy a zucchini casserole that fits perfectly into your low-carb meal plan without sacrificing flavor.
2. Zucchini and Sausage Casserole
If you’re craving a heartier dish, consider adding cooked sausage to your casserole. The rich, savory flavor of sausage complements the mild zucchini and adds a nice depth of flavor to the casserole.
Here’s how to make it:
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Cook the sausage ahead of time and crumble it into the casserole mixture before baking.
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Try using Italian sausage for an added punch of flavor, or opt for a milder sausage if you prefer a subtler taste.
3. Cheesy Zucchini Casserole with Bacon
For those who love cheese and bacon, this variation is a game-changer. Adding bacon to a cheesy zucchini casserole creates an irresistible flavor combination. The crispy bacon adds crunch and smokiness, while the melty cheese provides that comforting, gooey texture.
To make it:
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Cook the bacon until crispy, crumble it, and mix it into the zucchini mixture.
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Top the casserole with extra cheese before baking for a gooey, cheesy finish.
4. Zucchini Casserole with Mushrooms and Garlic
If you’re a fan of earthy flavors, consider adding sautéed mushrooms and garlic to your zucchini casserole. This variation is perfect for vegetarians or anyone who enjoys a hearty vegetable casserole.
To prepare:
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Sauté mushrooms in olive oil until golden brown, and then mix them into the zucchini filling along with the garlic.
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Add a sprinkle of fresh thyme or rosemary to complement the mushrooms’ flavor.
5. Zucchini Casserole with Tomatoes and Herbs
This variation adds a fresh, summery twist to your casserole. The juicy tomatoes balance the richness of the cheese and breadcrumbs, and the fresh herbs bring an aromatic fragrance to the dish.
To prepare:
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Layer sliced tomatoes over the zucchini mixture before baking.
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Add basil, oregano, and thyme for a fragrant herby touch.

Nutritional Benefits of Zucchini Casserole
Not only is zucchini casserole delicious, but it also packs a nutritional punch. Zucchini is a low-calorie vegetable that provides several essential nutrients, including vitamins A and C, potassium, and fiber. When combined with other ingredients like eggs, cheese, and breadcrumbs, zucchini casserole becomes a balanced meal with a mix of proteins, healthy fats, and carbohydrates.
Nutritional Breakdown (per serving):
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Calories: 263 kcal
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Protein: 13g
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Carbohydrates: 15g
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Fat: 17g (with 9g saturated fat)
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Fiber: 2g
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Sugar: 5g
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Sodium: 749mg
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Calcium: 295mg
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Iron: 1mg
Health Benefits:
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Rich in antioxidants: Zucchini is full of antioxidants like vitamin C and beta-carotene, which help protect your cells from damage caused by free radicals.
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Supports digestion: With its high fiber content, zucchini promotes healthy digestion and can help prevent constipation.
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Good for heart health: The potassium in zucchini supports heart health by helping regulate blood pressure.
Zucchini casserole can easily be turned into a one-dish meal that provides a balanced mix of nutrients, making it a great choice for a healthy, filling meal.
Storing and Reheating Zucchini Casserole
Zucchini casserole is a great dish to make in advance, and it stores and reheats well. Here’s how to keep it fresh for later:
Storing Leftovers:
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In the fridge: Store leftover zucchini casserole in an airtight container in the refrigerator for up to 3 days. It’s even great cold!
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In the freezer: For longer storage, freeze the casserole for up to 3 months. Let it cool completely before transferring it to a freezer-safe container.
Reheating Leftovers:
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In the oven: To reheat, place the casserole in a lightly greased, uncovered baking dish and heat at 350°F for 20-25 minutes or until heated through.
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In the microwave: You can also microwave individual servings on medium heat for 1-2 minutes, or until heated through.
Tip for Freezing:
If you’re planning to freeze the casserole, consider freezing it before baking. Assemble the casserole, cover it tightly with plastic wrap and aluminum foil, and freeze it. When you’re ready to bake, simply thaw it overnight in the fridge and bake as directed.
Why Zucchini Casserole Is Perfect for Every Meal
Zucchini casserole is a versatile dish that can be served in various ways. It makes an excellent side dish for dinner, but it can also stand alone as a main course, especially when you add meat or other vegetables. This dish is perfect for:
• Weeknight dinners: It’s easy to make and doesn’t take much time to prep or bake.
• Meal prep: It stores well and can be reheated, making it ideal for preparing in advance.
• Potlucks or family gatherings: Zucchini casserole is a crowd-pleaser, making it perfect for parties and gatherings.
• Vegetarian meals: When made without meat, it’s a great option for those following a vegetarian or plant-based diet.
Frequently Asked Questions (FAQs) About Zucchini Casserole
1. Can I make zucchini casserole ahead of time?
Yes, you can assemble the casserole ahead of time and refrigerate it for up to 24 hours before baking. This is a great way to save time on busy days. Just be sure to cover it tightly with plastic wrap or foil to prevent it from drying out. When you’re ready to bake, simply remove it from the fridge and bake as directed.
2. Can I use frozen zucchini for this recipe?
Fresh zucchini is always recommended for zucchini casserole, as it has a firmer texture that holds up better during baking. Frozen zucchini tends to release more water and may result in a mushier casserole. However, if you must use frozen zucchini, be sure to thaw and squeeze out as much excess moisture as possible before using it in the recipe.
3. What other vegetables can I add to zucchini casserole?
Zucchini casseroles are very versatile! You can add a variety of vegetables such as:
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Mushrooms for an earthy flavor.
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Carrots, either shredded or sliced, for a bit of sweetness.
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Bell peppers for added color and crunch.
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Spinach or kale for some leafy greens.
These vegetables not only enhance the flavor but also add more nutrition to your casserole.
4. Can I make zucchini casserole without cheese?
Yes, you can make zucchini casserole without cheese if you prefer a dairy-free version. Instead of cheese, you can use:
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Nutritional yeast for a cheesy flavor.
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Dairy-free cheese if you want to mimic the texture and taste of cheese.
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Creamy coconut milk or almond milk to add richness.
5. How do I prevent my zucchini casserole from being watery?
To avoid a watery casserole, be sure to follow these tips:
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Salt the zucchini: This helps to draw out excess moisture before it’s baked. After salting, squeeze out as much liquid as possible.
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Use fresh, firm zucchini: Overripe zucchini can have more water content, so it’s best to use fresh, firm zucchini for better texture.
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Bake immediately: If you wait too long after assembling, the zucchini may release too much water. It’s best to bake the casserole as soon as it’s assembled.
6. Can I add meat to zucchini casserole?
Absolutely! Ground meats like sausage, chicken, or turkey are excellent additions to zucchini casserole. For a more robust flavor, try Italian sausage, which pairs wonderfully with zucchini. Simply brown the meat before mixing it into the casserole ingredients.
7. Can I freeze zucchini casserole?
Yes, zucchini casserole can be frozen. To freeze:
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Assemble the casserole but do not bake it.
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Wrap it tightly with plastic wrap and foil, then store it in the freezer for up to 3 months.
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When you’re ready to bake, let it thaw in the refrigerator overnight and bake as directed. You may need to add a few extra minutes of baking time if it’s still a bit cold.
8. How long will zucchini casserole last in the fridge?
Zucchini casserole will last in the fridge for up to 3 days when stored in an airtight container. Leftovers can be reheated in the oven or microwave. It’s even delicious when served cold!
9. Can I use yellow squash instead of zucchini?
Yes, yellow squash is an excellent substitute for zucchini in this casserole recipe. It has a slightly different flavor, but it cooks similarly and provides the same tender texture. Feel free to swap zucchini with yellow squash or even use a mix of both.
10. What’s the best way to reheat leftover zucchini casserole?
The best way to reheat zucchini casserole is in the oven. Preheat your oven to 350°F (175°C), then place the casserole in a lightly greased, uncovered baking dish. Bake for 20-25 minutes, or until heated through. If you’re in a hurry, you can microwave individual portions for 1-2 minutes, but the oven method keeps the casserole’s texture better.
Conclusion on Zucchini Casserole Recipes
Zucchini casserole is an all-around winner. It’s easy to make, customizable, and packed with flavor and nutrition. Whether you stick with the classic version or try one of the variations mentioned, this dish is sure to become a staple in your meal rotation. So, next time you find yourself with an abundance of zucchini, turn it into a delicious casserole the whole family will love.
Enjoy this comforting and healthy dish, and make it your own with the endless possibilities for add-ins and toppings!
Zucchini Casserole Recipe
Ingredients:
- 9 cups shredded zucchini (about 2.5 pounds)
- 1 ½ teaspoons salt
- 2 teaspoons olive oil
- 1 small yellow onion, finely diced
- 3 cloves garlic, minced
- 3 large eggs, whisked
- ¼ cup heavy cream or sour cream
- 1 teaspoon Dijon mustard (optional)
- 1 ¼ cups panko breadcrumbs
- 1 cup shredded Parmesan cheese
- ½ teaspoon each of oregano, basil, garlic salt, and parsley
- ¼ teaspoon each of paprika, black pepper
- 1 ¼ cups shredded cheddar cheese (for topping)
Topping:
- ¼ cup panko breadcrumbs
- 1 tablespoon butter, melted
Instructions:
- Prepare the zucchini: Shred the zucchini and place it in a colander. Sprinkle with salt and let it sit for 15 minutes to release excess moisture. Squeeze out any remaining moisture using paper towels.
- Sauté the onions and garlic: Heat olive oil in a small skillet over medium heat. Add diced onions and cook for 5 minutes, then add minced garlic and sauté for another 2 minutes. Remove from heat.
- Combine the ingredients: In a large bowl, combine the squeezed zucchini, sautéed onions and garlic, eggs, heavy cream, Dijon mustard, panko breadcrumbs, Parmesan cheese, and seasonings. Stir well to combine.
- Assemble the casserole: Grease a 9×13-inch baking dish. Transfer the mixture into the dish and top with shredded cheddar cheese.
- Bake: Cover with foil and bake at 375°F for 35 minutes. Remove the foil, mix melted butter with the remaining panko breadcrumbs, and sprinkle over the casserole. Bake uncovered for an additional 15 minutes, or until golden brown.
- Rest and serve: Let the casserole sit for 5 minutes before serving.
Notes:
- Add-ins: Feel free to add ground sausage, mushrooms, peppers, or carrots for added flavor and nutrition.
- Low-carb version: Use almond flour or coconut flour instead of breadcrumbs for a low-carb alternative.
- Make ahead: You can assemble the casserole up to 24 hours ahead and refrigerate it before baking.
- Freezing: This casserole can be frozen before baking for up to 3 months. Thaw overnight in the fridge and bake as usual.
Nutritional Facts (per serving):
- Calories: 263 kcal
- Carbohydrates: 15g
- Protein: 13g
- Fat: 17g
- Saturated Fat: 9g
- Polyunsaturated Fat: 1g
- Monounsaturated Fat: 5g
- Trans Fat: 0.1g
- Cholesterol: 102mg
- Sodium: 749mg
- Potassium: 476mg
- Fiber: 2g
- Sugar: 5g
- Vitamin A: 838 IU
- Vitamin C: 26mg
- Calcium: 295mg
- Iron: 1mg
Prep time: 20 minutes
Cook time: 50 minutes
Total time: 1 hour 10 minutes
Method: Baking
Cuisine: American
Servings: 8
Yield: 1 casserole