Name: Baked Zucchini Squash Casserole
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: American
Ingredients: 2 lb. zucchini, cut into ½-inch circles; 2 lb. yellow squash, cut into ½-inch circles; 2 tablespoons butter; 2 tablespoons all-purpose flour; 1½ cups heavy cream; 2 teaspoons garlic, minced; ½ cup grated Parmesan cheese; ¼ teaspoon salt; 1/8 teaspoon black pepper; 1 pinch red pepper flakes

Jump to Recipe·Leave a Review

Baked Zucchini Squash Casserole is a creamy, cheesy side dish loaded with tender zucchini and yellow squash. Quick to prepare and full of flavor, it’s a perfect addition to any weeknight dinner or holiday spread.

Why You’ll Love This Recipe

Creamy and cheesy with tender squash
Perfect way to use summer zucchini and yellow squash
Quick and easy, ready in just 40 minutes

Simple ingredients, pantry-friendly
Mildly seasoned with garlic and a hint of red pepper flakes
Ideal as a side for chicken, beef, or seafood

Kid-friendly and appealing to all ages
Can be made ahead and baked when ready
Naturally gluten-free if using GF flour
Light yet satisfying vegetable casserole

Ingredients

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

2 lb. zucchini, cut into ½-inch circles
2 lb. yellow squash, cut into ½-inch circles

2 tablespoons butter
2 tablespoons all-purpose flour
1½ cups heavy cream
2 teaspoons garlic, minced
½ cup Parmesan cheese, grated
¼ teaspoon salt
⅛ teaspoon black pepper
1 pinch red pepper flakes

Directions

Preheat oven to 400°F.
Bring a large pot of salted water to a boil. Add zucchini and yellow squash and cook for about 10 minutes until tender. Drain and arrange in a greased 3-quart casserole dish. Set aside.
In a large pan over medium heat, melt butter. Whisk in flour and cook for about 1 minute. Gradually whisk in heavy cream until the mixture thickens.
Stir in minced garlic and Parmesan cheese. Season with salt, black pepper, and red pepper flakes.

Pour the creamy mixture evenly over the zucchini and squash in the casserole dish.
Bake for 15–20 minutes until the center is bubbly and the top is lightly golden.
Serve warm and enjoy!

Servings and timing

Servings: 8
Prep Time: 15 minutes
Cook Time: 25 minutes
Total Time: 40 minutes

Variations

Cheesy Topping: Add extra shredded mozzarella or cheddar on top before baking.
Herb Flavor: Mix in fresh thyme, basil, or parsley for added aroma.

Spicy Kick: Increase red pepper flakes slightly for more heat.
Breadcrumb Crust: Sprinkle panko breadcrumbs over the top for a crunchy topping.
Lightened Version: Substitute half-and-half or milk for heavy cream for a lighter casserole.

Vegetable Mix: Add bell peppers, carrots, or mushrooms for extra variety.

Storage/Reheating

Refrigerate: Store leftovers in an airtight container for up to 4 days.
Reheat (Oven): Bake at 350°F for 10–15 minutes until warmed through.

Reheat (Microwave): Heat individual portions for 1–2 minutes.
Do Not Freeze Creamy Version: The sauce may separate when thawed.

FAQs

Can I use frozen squash?

Yes, thaw and drain excess water before arranging in the casserole.

Can I make this ahead of time?

Yes, prepare the casserole and refrigerate; bake when ready to serve.

Can I make it dairy-free?

Substitute butter with vegan butter and heavy cream with a plant-based alternative.

Can I add more cheese?

Yes, extra Parmesan or shredded cheese works well for a richer dish.

Can I use gluten-free flour?

Yes, substitute all-purpose flour with a gluten-free flour blend.

How do I prevent the casserole from being watery?

Drain the cooked squash thoroughly before adding the cream sauce.

Can I add protein?

Yes, cooked chicken, sausage, can be mixed in before baking.

Can I use different seasonings?

Yes, Italian seasoning or fresh herbs like thyme or rosemary enhance the flavor.

Can I make mini casseroles?

Yes, divide ingredients into smaller ramekins for individual servings.

How do I know when it’s done?

The sauce should be bubbly and slightly thickened, with the top lightly golden.

Conclusion

Baked Zucchini Squash Casserole is a creamy, cheesy, and comforting vegetable side dish that highlights the flavors of summer squash. Quick, easy, and versatile, it’s perfect for family dinners, potlucks, or holiday meals, and is sure to become a favorite in your recipe rotation.