Name: Cheesy Baked Zucchini Casserole
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Cuisine: American
Ingredients: 4 medium zucchini, thinly sliced; 1 small onion, finely diced; 2 large eggs; 1/2 cup sour cream or Greek yogurt; 1 cup cheddar cheese, shredded; 1 cup mozzarella cheese, shredded; 1/2 cup Parmesan cheese, grated; 1/2 tsp garlic powder; 1 tsp dried oregano or Italian seasoning; Salt and black pepper, to taste; 1/2 cup bread crumbs or crushed crackers, for topping; 2 tbsp olive oil or butter

Why You’ll Love This Recipe

This zucchini casserole is hearty yet light, making it a great way to enjoy vegetables in a flavorful, cheesy dish. It’s quick to prepare, bakes beautifully, and pairs well with a variety of main courses. Whether you’re trying to use up garden zucchini or looking for a new side dish favorite, this casserole is guaranteed to please.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Zucchini, thinly sliced
Onion, finely diced
Eggs
Sour cream or Greek yogurt
Cheddar cheese, shredded
Mozzarella cheese, shredded
Parmesan cheese, grated
Garlic powder
Dried oregano or Italian seasoning
Salt and pepper
Bread crumbs or crushed crackers for topping
Olive oil or butter

Directions

Preheat the oven to 375°F and lightly grease a baking dish.
Slice the zucchini thinly and pat dry with a paper towel to remove excess moisture.
In a mixing bowl, whisk eggs, sour cream, garlic powder, oregano, salt, and pepper.
Stir in cheddar and mozzarella cheese, then fold in the zucchini and onion.
Transfer the mixture into the prepared baking dish.
Sprinkle Parmesan cheese and bread crumbs on top, then drizzle with olive oil or dot with butter.
Bake for 30–35 minutes, or until the casserole is bubbly and golden brown on top.
Let cool slightly before serving.

Servings and timing

This recipe makes 6 servings.
Prep time: 15 minutes
Cook time: 35 minutes
Total time: 50 minutes

Variations

Add cooked ground beef, chicken, or turkey to make it a main dish.
Swap zucchini for yellow squash or use a mix of both.
Use pepper jack cheese for a spicier flavor.
Add fresh herbs like basil or parsley for extra freshness.

Storage/Reheating

Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven at 350°F until warmed through to maintain crispiness, or microwave for a quicker option. This casserole also freezes well; store in a freezer-safe container for up to 2 months, then thaw overnight before reheating.

FAQs

Can I make this casserole ahead of time?

Yes, assemble it in advance, refrigerate overnight, and bake when ready to serve.

How do I prevent the casserole from getting watery?

Be sure to pat the zucchini slices dry before mixing, and don’t skip the bread crumb topping.

Can I make this low-carb?

Yes, simply omit the bread crumb topping or replace it with a keto-friendly alternative.

What cheeses work best?

A mix of cheddar, mozzarella, and Parmesan gives the best balance of flavor and creaminess.

Can I freeze zucchini casserole?

Yes, freeze before or after baking. For best results, bake from thawed.

Is it possible to make this dairy-free?

Yes, use dairy-free cheese and yogurt substitutes.

Can I add more vegetables?

Absolutely, mushrooms, bell peppers, or spinach work well in this dish.

Do I need to peel the zucchini?

No, the peel is tender and adds extra nutrients, so there’s no need to peel.

Can I use frozen zucchini?

Yes, but thaw it first and squeeze out any excess liquid.

What main dishes pair well with this casserole?

It pairs perfectly with roasted chicken, grilled steak, or baked fish.

Conclusion

Cheesy baked zucchini casserole is a versatile and delicious side dish that turns simple zucchini into something special. With its cheesy, creamy texture and golden topping, it’s a crowd-pleaser that works for family dinners or festive gatherings. This easy recipe is sure to become one of your go-to casseroles.