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Cheesy Zucchini and Ground Beef Casserole: A Hearty Step-by-Step Comfort Food Recipe

Cheesy Zucchini and Ground Beef Casserole is a warm, satisfying baked dish made with seasoned ground beef, tender zucchini, tomato sauce, herbs, and melted cheese. It is rich enough to serve as a full dinner, but it also includes plenty of vegetables, making it a balanced and comforting meal.

This casserole is perfect for busy weeknights, family dinners, meal prep, or when you have extra zucchini and want to turn it into something filling. The zucchini becomes soft and flavorful as it bakes, while the ground beef adds a savory base. The cheese melts over the top, creating a golden, creamy finish.

Why This Recipe Works

Zucchini has a mild flavor, so it absorbs the taste of the beef, garlic, onion, tomato sauce, and seasonings very well. The ground beef gives the casserole richness, while the cheese brings everything together.

The most important part of this recipe is controlling the moisture from the zucchini. Zucchini naturally contains a lot of water, so lightly salting and draining it before baking helps prevent the casserole from becoming watery.

Ingredients

For the Casserole

1 ½ pounds ground beef
3 medium zucchini, sliced into half-moons or rounds
1 small onion, diced
3 cloves garlic, minced
1 tablespoon olive oil
1 can diced tomatoes, about 14–15 oz
1 cup tomato sauce or marinara sauce
2 tablespoons tomato paste
1 teaspoon Italian seasoning
½ teaspoon dried oregano
½ teaspoon paprika
½ teaspoon garlic powder
½ teaspoon black pepper
1 teaspoon salt, divided
½ teaspoon red pepper flakes, optional
1 ½ cups shredded mozzarella cheese
1 cup shredded cheddar cheese
¼ cup grated parmesan cheese
2 tablespoons chopped parsley or basil, optional

Optional Add-Ins

1 cup cooked rice
1 cup cooked pasta
½ cup sour cream or cream cheese for a creamier version
Mushrooms
Bell peppers
Corn
Spinach
Jalapeños

Step 1: Prepare the Zucchini

Wash the zucchini and dry it well. Cut off both ends, then slice the zucchini into medium-thick rounds or half-moons.

Place the sliced zucchini in a bowl and sprinkle it with about ½ teaspoon salt. Toss gently and let it sit for 15 to 20 minutes.

This step draws out extra water from the zucchini. After resting, pat the slices dry with paper towels. This helps the casserole bake up thick and flavorful instead of watery.

Step 2: Brown the Ground Beef

Preheat your oven to 375°F / 190°C.

Heat a large skillet over medium-high heat. Add the ground beef and break it apart with a spoon.

Cook until the beef is browned and no pink remains. This usually takes 6 to 8 minutes.

Drain any excess grease from the pan. Too much grease can make the casserole heavy and oily.

Step 3: Add Onion and Garlic

Add the diced onion to the cooked beef. Cook for 3 to 4 minutes until the onion becomes soft.

Add the minced garlic and cook for another 30 seconds. Stir often so the garlic does not burn.

The onion and garlic create the main flavor base of the casserole, giving the beef a deeper homemade taste.

Step 4: Build the Tomato Beef Sauce

Add the diced tomatoes, tomato sauce, and tomato paste to the skillet.

Season with Italian seasoning, oregano, paprika, garlic powder, black pepper, red pepper flakes if using, and the remaining salt.

Stir everything together and let the sauce simmer for 5 to 7 minutes. This allows the tomato flavor to deepen and the beef to absorb the seasonings.

The mixture should be saucy but not too watery. If it looks very thin, let it simmer uncovered for a few extra minutes.

Step 5: Lightly Cook the Zucchini

In another skillet, heat the olive oil over medium heat.

Add the zucchini slices and cook for 3 to 4 minutes, just until they begin to soften slightly.

You do not need to fully cook them because they will continue baking in the oven. The goal is only to remove some moisture and give them better texture.

After cooking, remove the zucchini from the pan and set it aside.