Cheesy, saucy, and loaded with zucchini!

This Cheesy Zucchini Bake is packed with tender zucchini, rich tomato sauce, savory Italian seasoning, and plenty of gooey melted cheese. It makes a delicious vegetarian main dish or the perfect side for chicken, steak, or pasta!

Ingredients

For the Zucchini

4 medium zucchini, sliced into rounds or half-moons
1 tablespoon olive oil
1 small onion, finely diced
3 cloves garlic, minced
½ teaspoon salt
½ teaspoon black pepper
1 teaspoon Italian seasoning
½ teaspoon paprika, optional

For the Saucy Layer

2 cups marinara or tomato pasta sauce
1 tablespoon tomato paste, optional for a richer sauce
½ teaspoon red pepper flakes, optional

For the Cheesy Topping

1½ cups shredded mozzarella cheese
½ cup shredded cheddar cheese
½ cup grated Parmesan cheese
¼ cup chopped fresh basil or parsley

Instructions

1. Preheat the Oven

Preheat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish.

2. Cook the Zucchini

Heat the olive oil in a large skillet over medium-high heat. Add the onion and cook for 2–3 minutes until softened.

Add the garlic and cook for another 30 seconds.

Add the zucchini, salt, pepper, Italian seasoning, and paprika. Cook for 5–7 minutes, stirring occasionally, until the zucchini begins to soften.

3. Add the Sauce

Pour in the marinara sauce and tomato paste. Add red pepper flakes if you like a little heat.

Stir everything together and simmer for 3–5 minutes.

4. Assemble the Casserole

Transfer half of the zucchini mixture to the prepared baking dish.

Sprinkle with half of the mozzarella, cheddar, and Parmesan.

Add the remaining zucchini mixture and top with the remaining cheeses.

5. Bake Until Bubbly

Bake uncovered for 20–25 minutes, until the cheese is melted, golden, and bubbling around the edges.

For an extra golden top, broil for 1–2 minutes, watching carefully.

6. Garnish and Serve

Remove from the oven and let the casserole rest for 5 minutes. Sprinkle with fresh basil or parsley before serving.

Recipe Details

Prep Time: 15 minutes
Cook Time: 30–35 minutes
Total Time: About 45–50 minutes
Servings: 6

Tips & Variations

Add protein: Mix in cooked ground beef, Italian sausage, shredded chicken, or turkey.
Make it low-carb: Enjoy it as is or serve with a fresh salad.
Avoid watery zucchini: After slicing, sprinkle the zucchini lightly with salt and let it sit for 15 minutes. Pat dry before cooking.
Extra creamy: Add small dollops of ricotta or cream cheese between the layers.
Spicy version: Add extra red pepper flakes or sliced jalapeños.
Meal prep: Store leftovers in an airtight container in the refrigerator for up to 3–4 days.

Nut Information

This recipe is nut-free as written. However, always check store-bought marinara sauce, shredded cheese, and seasonings for allergen warnings or possible cross-contact if serving someone with a severe nut allergy.

Frequently Asked Questions

Q: Can I make this ahead of time?
A: Yes! Assemble the casserole up to 24 hours ahead, cover, and refrigerate. Bake when ready, adding a few extra minutes if chilled.

Q: Can I freeze it?
A: Yes, but zucchini can release extra moisture after freezing. For the best texture, freeze the cooked casserole in portions for up to 2 months.

Q: Can I use yellow squash instead?
A: Absolutely! Yellow squash works beautifully and can be combined with zucchini.

Q: What should I serve with it?
A: Try garlic bread, grilled chicken, pasta, rice, or a crisp green salad.

Author
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Sara Mitchell

Sara Mitchell is an expert restaurant content creator who writes easy-to-read guides about CAVA and other Mediterranean fast-casual chains in the United States. She covers locations, menus, prices, and hours, making it simple for visitors to find nearby restaurants and what to order quickly.

With years of experience in restaurant research and local SEO, Sara creates accurate, user-friendly guides that work for both people and search engines. Her goal is to help users go from search results to their nearest restaurant or menu choice with as few clicks as possible.