A comforting low-carb casserole made with seasoned ground beef, tender zucchini, tomato sauce, and plenty of melted cheese. It’s easy enough for a weeknight dinner and works beautifully as a family-style meal.
Ingredients
For the Beef Mixture
1 lb (450 g) lean ground beef
1 tablespoon olive oil, if needed
1 small yellow onion, finely diced
3 cloves garlic, minced
1 teaspoon Italian seasoning
1 teaspoon paprika
1/2 teaspoon onion powder
1/2 teaspoon salt
1/2 teaspoon black pepper
1/4 teaspoon red pepper flakes, optional
1 cup crushed tomatoes or tomato sauce
2 tablespoons tomato paste
1 teaspoon Worcestershire sauce, optional
For the Zucchini
3 medium zucchini, sliced into thin rounds
1/2 teaspoon salt
1 tablespoon olive oil
For the Cheese Topping
1 cup shredded mozzarella cheese
1/2 cup shredded cheddar cheese
1/4 cup grated Parmesan cheese
1 tablespoon chopped fresh parsley, optional
Instructions
1. Preheat the oven
Preheat your oven to 375°F (190°C). Lightly grease a 9 × 13-inch baking dish.
2. Prepare the zucchini
Slice the zucchini into approximately 1/4-inch rounds. Sprinkle lightly with salt and let them sit for about 10 minutes.
Pat the zucchini thoroughly with paper towels. This helps remove excess moisture and prevents the finished casserole from becoming watery.
3. Brown the beef
Heat a large skillet over medium-high heat. Add the olive oil if needed, followed by the ground beef.
Cook for 5–7 minutes, breaking the beef apart with a spoon, until browned and no longer pink.
Drain excess grease if necessary.
4. Add onion and garlic
Add the diced onion and cook for about 3–4 minutes, until softened.
Add the minced garlic and cook for another 30–60 seconds.
5. Season the beef
Add Italian seasoning, paprika, onion powder, salt, black pepper, and red pepper flakes.
Stir well and cook for about 1 minute.
6. Add the tomato mixture
Stir in the crushed tomatoes, tomato paste, and Worcestershire sauce.
Simmer uncovered for 5–7 minutes, stirring occasionally, until the sauce thickens slightly.
7. Layer the casserole
Arrange half of the zucchini slices in the prepared baking dish.
Spread half of the beef mixture over the zucchini.
Sprinkle with about half of the mozzarella and cheddar.
Repeat with the remaining zucchini and beef mixture.
Finish with the remaining mozzarella, cheddar, and Parmesan.
8. Bake
Cover loosely with foil and bake for 20 minutes.
Remove the foil and bake for another 15–20 minutes, until the zucchini is tender and the cheese is melted, bubbly, and lightly golden.
9. Rest and serve
Let the casserole rest for 5–10 minutes before serving. Garnish with fresh parsley if desired.
Recipe Information
Prep Time: 20 minutes
Cook Time: 40–45 minutes
Total Time: About 1 hour
Servings: 6
Course: Main Dish
Cuisine: American
Difficulty: Easy
Best For: Weeknight dinner, meal prep, family meals
Approximate Nutrition
Per serving, assuming 6 servings:
Calories: 380–420 kcal
Protein: 30–34 g
Carbohydrates: 10–13 g
Fiber: 2–3 g
Net Carbohydrates: 7–10 g
Fat: 25–29 g
Saturated Fat: 11–13 g
Sugar: 5–7 g
Sodium: 650–800 mg
Cholesterol: 85–100 mg
Nutrition is approximate and will vary depending on the ground beef, cheese, tomato sauce, and portion size used.
Nut & Allergen Information
Peanuts: None in the standard recipe.
Tree Nuts: None.
Milk/Dairy: Contains dairy from mozzarella, cheddar, and Parmesan.
Eggs: None.
Soy: Usually none, but check Worcestershire sauce and packaged tomato products.
Wheat/Gluten: The basic ingredients are naturally gluten-free, but Worcestershire sauce and seasoning blends should be checked for gluten-containing ingredients.
Sesame: None in the standard recipe.
Mustard: Not intentionally included, but check Worcestershire sauce labels.
Allium: Contains onion and garlic.
Tips for the Best Zucchini Bake
Don’t skip draining the zucchini. Zucchini releases a lot of water while baking.
Slice the zucchini evenly so it cooks at the same rate.
Use lean ground beef to reduce excess grease.
For a richer flavor, use freshly shredded cheese instead of pre-shredded cheese.
Don’t overcook the zucchini; it should be tender but not mushy.
Let the casserole rest before cutting so the layers can set.
For a browned cheesy top, broil for 1–2 minutes at the end, watching carefully.
Variations
Low-Carb/Keto:
Use a tomato sauce with no added sugar and choose full-fat cheeses. Keep the Worcestershire sauce optional after checking its carbohydrate content.
Extra Cheesy:
Add another 1/2 cup mozzarella or a little Monterey Jack cheese.
Spicy:
Add diced jalapeño, extra red pepper flakes, or a pinch of cayenne.
Mediterranean Style:
Add oregano, diced bell peppers, spinach, and a little crumbled feta.
Creamy Version:
Stir 2–3 tablespoons of cream cheese into the beef mixture before layering.
Frequently Asked Questions
Q: How do I stop Cheesy Beef Zucchini Bake from becoming watery?
Salt the sliced zucchini briefly, pat it dry, and avoid adding too much tomato sauce. Baking uncovered during the second half also helps excess moisture evaporate.
Q: Can I use ground turkey instead of beef?
Yes. Ground turkey works well as a lighter alternative. You may need a little extra olive oil to keep it moist.
Q: Can I prepare this casserole ahead of time?
Yes. Assemble it, cover it, and refrigerate it for up to about 24 hours. Add a few extra minutes to the baking time if it goes directly from the refrigerator into the oven.
Q: Can I freeze it?
You can freeze it, although zucchini may become softer after thawing. For better texture, cool the casserole completely, portion it, and freeze in airtight containers.
Q: Can I use frozen zucchini?
Fresh zucchini is recommended. Frozen zucchini contains more water and can make the casserole watery.
Q: What cheese works best?
Mozzarella provides excellent melting, cheddar adds stronger flavor, and Parmesan gives the top a savory, slightly crisp finish.
Q: Is this recipe low-carb?
Yes. It is relatively low in carbohydrates compared with traditional pasta or potato casseroles. For strict keto diets, use a low-sugar tomato sauce and check all packaged ingredients.
Q: What can I serve with it?
Serve it with a green salad, roasted vegetables, steamed broccoli, cauliflower rice, or garlic bread for those who aren’t following a low-carb diet.
Q: How should I store leftovers?
Store cooled leftovers in an airtight container in the refrigerator and consume within 3–4 days. Reheat individual portions in the microwave or oven until hot.
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.
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