Dinner

Ground Beef and Zucchini Casserole Recipe

Bymia larkspur April 12, 2026April 12, 2026

Introduction

This Ground Beef and Zucchini Casserole is a hearty, flavorful dish that combines lean ground beef with tender zucchini and rich cheeses. It’s an easy, comforting meal perfect for weeknights when you want something satisfying yet simple to prepare.

The dish is a layered baked casserole served in a white rectangular baking dish. The bottom layer is a bright red tomato sauce that lightly spills over the edge, followed by a thick, crumbled brown meat layer mixed with green herbs. On top of the meat layer, there is a smooth, melted cheese layer with golden brown spots where it has browned under heat. The topmost layer features evenly spaced, round green zucchini slices with slightly browned edges. The surface beneath the dish is a white marbled texture. photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 lb ground beef (lean preferred)
2 medium zucchini, diced or sliced
1 small onion, chopped
2 cloves garlic, minced
1 can (14.5 oz) diced tomatoes, drained
1 tablespoon tomato paste
1 teaspoon Italian seasoning
½ teaspoon paprika
Salt and pepper, to taste
1½ cups shredded mozzarella cheese
½ cup grated Parmesan cheese
1 cup shredded cheddar (optional, for extra cheesiness)
2 tablespoons olive oil
Optional: ¼ teaspoon red pepper flakes (for spice)

Instructions

Step 1: Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish or a similar casserole dish.
Step 2: In a large skillet over medium heat, warm 1 tablespoon of olive oil. Add the ground beef and cook until browned, about 6–8 minutes. Drain any excess fat.
Step 3: Add the chopped onion and minced garlic to the beef. Cook for 2–3 minutes until the onion softens. Stir in the tomato paste, drained diced tomatoes, Italian seasoning, paprika, salt, and pepper. Let the mixture simmer for 5 minutes, then set aside.
Step 4: In a separate skillet, or the same one wiped clean, heat the remaining tablespoon of olive oil. Add the zucchini and sauté for 4–5 minutes until just tender but still firm.
Step 5: In the prepared baking dish, spread half of the zucchini evenly. Layer half of the beef mixture over the zucchini. Sprinkle a combination of mozzarella and Parmesan cheese on top. Repeat the layering with the remaining zucchini and beef, finishing with the cheeses. Add cheddar on top if using.
Step 6: Cover the casserole loosely with foil and bake for 20 minutes. Remove the foil and bake for an additional 10–15 minutes until the cheese is bubbly and golden brown.
Step 7: Allow the casserole to rest for 5–10 minutes before slicing. This helps the layers set and makes serving easier.

Tips & Variations

For extra flavor, add a pinch of red pepper flakes when cooking the beef mixture.
Swap zucchini with yellow squash or eggplant for a different veggie twist.
Use ground turkey or chicken as a leaner alternative to beef.
Adding fresh basil or oregano as a garnish brightens the dish.

Storage

Store any leftovers in an airtight container in the refrigerator for up to 3 days. Reheat individual portions in the microwave or cover with foil and warm in a 350°F (175°C) oven until heated through. For longer storage, freeze the casserole for up to 2 months and thaw overnight before reheating.

How to Serve

The dish is a layered baked casserole in a white ceramic baking dish. The bottom layer is a bright red tomato sauce with a slightly chunky texture. On top of that, there is a thick layer of brown cooked ground meat mixed with some green herbs. Above the meat, there is a layer of melted white cheese with a bubbly and golden brown surface. The top layer has slices of green zucchini that are slightly browned and roasted, scattered evenly across the cheese. The bake is visibly hot and gooey with some sauce spilled around the edges. The photo is taken on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I make this casserole ahead of time?

Yes, you can assemble the casserole a day in advance and keep it covered in the refrigerator. Bake it just before serving, adding a few extra minutes to the baking time if it’s chilled.