Yellow Squash and Zucchini Casserole

Yellow Squash and Zucchini Casserole is a comforting, cheesy baked dish that celebrates the natural flavors of summer squash. Layered with tender slices of zucchini and yellow squash, a creamy sauce, and a crunchy golden topping, this casserole is perfect as a hearty side or even a light vegetarian main course. It’s simple, satisfying, and full of garden-fresh goodness.

Why You’ll Love This Recipe

This casserole is the ultimate blend of creamy, savory, and crispy. It’s an easy way to use up an abundance of summer squash and transforms simple vegetables into a delicious, crowd-pleasing dish. Whether you’re feeding a family, contributing to a potluck, or looking for a new meatless meal idea, this casserole fits the bill. It’s also make-ahead friendly and reheats beautifully.

ingredients

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

• Yellow squash, thinly sliced
• Zucchini, thinly sliced
• Onion, chopped
• Garlic, minced
• Eggs
• Milk or half-and-half
• Shredded cheddar cheese
• Parmesan cheese
• Breadcrumbs (plain or seasoned)
• Butter
• Olive oil
• Salt
• Black pepper
• Fresh herbs (optional, such as thyme or parsley)

directions

1. Preheat the oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
2. In a large skillet, heat olive oil over medium heat. Add the onion and garlic and sauté until softened, about 3–4 minutes.
3. Add the sliced squash and zucchini and cook for 5–6 minutes, stirring occasionally, until slightly tender but not mushy. Season with salt and pepper.
4. In a mixing bowl, whisk together eggs and milk. Stir in the shredded cheddar and half of the Parmesan.
5. Combine the cooked vegetables with the egg mixture and pour into the prepared baking dish.
6. In a small bowl, mix the breadcrumbs with melted butter and the remaining Parmesan cheese. Sprinkle evenly over the casserole.
7. Bake uncovered for 25–30 minutes, or until the top is golden brown and the casserole is set.
8. Let rest for 5–10 minutes before serving. Garnish with fresh herbs if desired.

Servings and timing

This recipe serves 6–8 people.
Prep time: 15 minutes
Cook time: 30 minutes
Total time: 45 minutes

Variations

• Add Protein: Stir in cooked chicken, turkey, or crumbled sausage for a more filling dish.
• Make It Gluten-Free: Use gluten-free breadcrumbs or crushed gluten-free crackers for the topping.
• Cheese Swap: Try mozzarella, Monterey Jack, or Gruyère for different flavor profiles.
• Spicy Kick: Add red pepper flakes or chopped jalapeños to the sautéed vegetables.
• Low-Carb Option: Omit breadcrumbs and top with crushed pork rinds or almond flour mixed with cheese.

storage/reheating

Store leftovers in an airtight container in the refrigerator for up to 4 days.

To reheat:

• Oven: Cover with foil and warm at 350°F for 15–20 minutes.
• Microwave: Heat individual portions for 1–2 minutes until warmed through.

This casserole can also be assembled ahead of time and baked just before serving. It’s not recommended to freeze after baking, as the texture may become watery.

FAQs

Can I use only zucchini or only yellow squash?

Yes, you can use either one if that’s what you have. The flavor and texture will still work great.

Do I need to peel the squash and zucchini?

No, the skins are thin and edible. Just wash them well before slicing.

Can I make this casserole ahead of time?

Yes. Assemble it up to a day in advance, cover, and refrigerate. Bake it just before serving.

What’s the best cheese to use?

Sharp cheddar offers a bold flavor, but you can also use Swiss, mozzarella, or a cheese blend.

Can I freeze this casserole?

It’s best enjoyed fresh, but you can freeze it before baking. Thaw in the fridge overnight and bake as directed.

How do I keep the casserole from getting watery?

Sautéing the squash helps reduce moisture. You can also lightly salt the sliced squash and let it sit for 10–15 minutes, then blot dry before cooking.

Is this recipe vegetarian?

Yes, it contains no meat. Just be sure to use vegetarian-friendly cheese if needed.

Can I use pre-shredded cheese?

Yes, but freshly grated cheese melts more smoothly and evenly.

What should I serve with this casserole?

It pairs well with grilled meats, roasted chicken, or a fresh green salad.

Can I use a different topping?

Yes, try crushed Ritz crackers, panko, or even crushed cornflakes mixed with butter.

Conclusion

Yellow Squash and Zucchini Casserole is a flavorful, comforting, and easy-to-make dish that celebrates fresh vegetables in the most delicious way. Whether you’re using up garden produce or just looking for a reliable side dish, this casserole delivers rich flavor and satisfying texture with every bite. It’s a guaranteed hit at any table.

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