Recipe Details
Prep time: 20 minutes
Cook time: 35–45 minutes
Total time: 55–65 minutes
Servings: 6
Difficulty: Easy
Cooking method: Oven-baked
Oven temperature: 375°F (190°C)
Ingredients
For the casserole
1½ lb (680 g) lean ground beef
3 medium zucchini, thinly sliced
1 medium onion, finely chopped
3 garlic cloves, minced
1 cup (150 g) diced tomatoes, drained
1 tablespoon olive oil
1 teaspoon Italian seasoning
1 teaspoon paprika
½ teaspoon dried oregano
½ teaspoon salt, or to taste
½ teaspoon black pepper
¼ teaspoon red pepper flakes, optional
For the cheese topping
1 cup (100 g) shredded mozzarella cheese
1 cup (100 g) shredded cheddar cheese
¼ cup (25 g) grated Parmesan cheese
2 tablespoons chopped fresh parsley
Optional creamy binder
2 large eggs
½ cup (120 g) plain Greek yogurt or sour cream
The eggs and yogurt help bind the casserole together, making it easier to cut into neat slices. You can omit them for a looser, more layered casserole.
Step-by-Step Instructions
Step 1: Preheat the oven
Preheat your oven to 375°F (190°C). Lightly grease a 9 × 13-inch baking dish with olive oil or cooking spray.
Step 2: Prepare the zucchini
Wash the zucchini and cut it into thin, even slices.
Sprinkle lightly with salt and leave for 10 minutes.
Pat dry with paper towels to remove excess moisture.
This step helps prevent a watery casserole.
Step 3: Cook the ground beef
Heat olive oil in a large skillet over medium-high heat.
Add the chopped onion and cook for 3–4 minutes until softened.
Add the ground beef and cook for 6–8 minutes, breaking it apart with a spoon.
Stir in the garlic, Italian seasoning, paprika, oregano, black pepper, and optional chili flakes.
Cook until the beef reaches 160°F (71°C).
Drain excess fat if needed, then stir in the drained diced tomatoes.
Step 4: Prepare the creamy binder (optional)
In a bowl, whisk together the eggs and Greek yogurt or sour cream.
Stir in half of the mozzarella and half of the cheddar.
Let the cooked beef mixture cool slightly before combining it with the egg mixture, if desired.
Step 5: Assemble the casserole
Arrange half of the zucchini slices in the prepared baking dish.
Spread half of the beef mixture over the zucchini.
Repeat with the remaining zucchini and beef.
If using the creamy binder, pour it evenly over the layers.
Sprinkle the remaining mozzarella, cheddar, and Parmesan over the top.
Step 6: Bake
Cover loosely with foil and bake for 20 minutes.
Remove the foil and bake for another 15–25 minutes, until the zucchini is tender and the cheese is melted and golden.
If you want a more browned top, broil briefly for 1–2 minutes, watching carefully.
The center should be hot and bubbling. If using eggs, make sure the center is fully set and reaches 160°F (71°C).
Step 7: Rest and serve
Allow the casserole to rest for 10 minutes before slicing. Garnish with fresh parsley and serve warm.
Nutrition Information
Estimated per serving, assuming 6 servings and the optional egg-and-yogurt binder is used.
Nutrient
Approximate amount
Calories
400–480 kcal
Protein
32–40 g
Carbohydrates
10–16 g
Fat
25–32 g
Fiber
2–4 g
Sodium
500–800 mg
Values vary with the fat content of the beef, cheese brands, and optional ingredients.
Nut Information & Allergens
Peanuts: None included in the standard recipe.
Tree nuts: None included in the standard recipe.
Dairy: Contains mozzarella, cheddar, Parmesan, and optional yogurt or sour cream.
Eggs: Present if you use the optional binder.
Gluten/wheat: No gluten-containing ingredients are required, but check packaged seasonings and cheese labels.
Soy: Not intentionally included in the standard recipe; check packaged ingredient labels.
Allergy precaution: Check all labels for allergen and cross-contact warnings. If preparing this for someone with a serious allergy, use ingredients verified safe for them.
Helpful Tips
Avoid excess liquid: Pat the zucchini dry and drain the tomatoes well.
Choose lean beef: This helps prevent excess grease from collecting in the dish.
Customize the cheese: Monterey Jack or provolone can replace some of the mozzarella.
Add more vegetables: Bell peppers, mushrooms, or spinach work well; cook watery vegetables first.
For a lower-carb version: Omit the optional tomatoes or reduce their quantity if you prefer.
For meal prep: Assemble the casserole ahead, cover, refrigerate, and bake within 24 hours. Add extra baking time if it is cold from the refrigerator.
Questions & Answers
Q: Can I use ground turkey instead of beef?
Yes. Ground turkey works well. Cook it to an internal temperature of 165°F (74°C) before assembling.
Q: Why is my zucchini casserole watery?
Zucchini naturally releases moisture. Salt the slices briefly, pat them dry, and avoid adding undrained tomatoes.
Q: Can I make this casserole without eggs?
Yes. Simply leave out the eggs and yogurt mixture. The casserole will be less firmly bound but still delicious.
Q: Can I make it ahead of time?
Yes. Assemble and refrigerate for up to 24 hours before baking. Make sure the center becomes fully hot during cooking.
Q: How should I store leftovers?
Refrigerate within 2 hours in a covered container and use within 3–4 days. Reheat until steaming hot throughout.
Q: Can I freeze this casserole?
Yes. Cool completely, divide into portions, and freeze in airtight containers for up to 2–3 months for best quality. Zucchini may become softer after thawing.
Q: What should I serve with it?
Serve with a green salad, steamed broccoli, roasted vegetables, or cauliflower rice.
Enjoy your cheesy, comforting Zucchini Ground Beef Casserole!