A hearty, cheesy casserole made with seasoned ground beef, tender zucchini, savory marinara, and plenty of melted cheese. It has the comforting feel of baked pasta or lasagna without the pasta. Salting and drying the zucchini first helps prevent the casserole from becoming watery.
Prep Time: 20 minutes
Cook Time: 25–30 minutes
Total Time: 50–55 minutes
Servings: 6
Ingredients
For the Zucchini
3 medium zucchini, about 1½ lb (680 g)
¾ tsp salt, divided
1 tbsp olive oil
For the Beef Sauce
1 lb (450 g) lean ground beef
1 small yellow onion, finely chopped
1 small bell pepper, diced
3 cloves garlic, minced
2 tsp Italian seasoning
¼ tsp crushed red pepper flakes, optional
1¼ cups (300 ml) no-sugar-added marinara sauce
2 oz (55 g) cream cheese, cubed
¼ tsp black pepper
Salt, to taste
For the Cheesy Topping
1 cup (115 g) shredded low-moisture mozzarella
½ cup (55 g) shredded sharp cheddar
2 tbsp grated Parmesan
2 tbsp fresh basil or parsley, chopped
The combination of mozzarella, cheddar, and Parmesan gives the casserole a stretchy, flavorful, browned topping.
Instructions
- Prepare the Zucchini
Preheat the oven to 375°F (190°C).
Lightly grease a 9 × 13-inch baking dish.
Slice the zucchini into approximately ¼-inch rounds.
Place the slices in a large bowl and sprinkle with ½ tsp salt.
Toss gently and let them sit for 10–15 minutes.
Pat the zucchini very dry with paper towels.
This step is important: zucchini releases a lot of water while baking, and removing some of that moisture helps prevent a watery casserole.
- Brown the Ground Beef
Heat 1 tbsp olive oil in a large skillet over medium-high heat.
Add the ground beef.
Cook for about 5–7 minutes, breaking it apart with a wooden spoon, until browned and cooked through.
Drain excess grease if necessary.
- Add the Vegetables
Add the chopped onion and diced bell pepper.
Cook for 3–4 minutes, until the vegetables begin to soften.
Add the minced garlic, Italian seasoning, red pepper flakes, remaining salt, and black pepper.
Cook for another 30–60 seconds, stirring constantly.
- Make the Creamy Beef Sauce
Stir in the marinara sauce and cream cheese.
Reduce the heat to medium-low.
Cook for 2–3 minutes, stirring until the cream cheese melts into the sauce and the mixture becomes thick and creamy.
If the sauce looks watery, simmer for another minute or two.
5. Layer the Casserole
Spread a thin layer of beef sauce across the bottom of the prepared baking dish.
Add half of the zucchini slices in an even layer.
Spread half of the remaining beef sauce over the zucchini.
Add the remaining zucchini.
Finish with the remaining beef sauce.
- Add the Cheese
Sprinkle evenly with:
Mozzarella
Cheddar
Parmesan
Make sure the cheese reaches the edges for those delicious golden, bubbly corners.
- Bake
Bake uncovered for approximately 22–26 minutes, until:
The sauce is bubbling
The zucchini is tender
The cheese is completely melted
For a more golden top, switch the oven to broil for 1–2 minutes.
Watch carefully during broiling so the cheese doesn’t burn.
- Rest Before Serving
Remove the casserole from the oven and let it rest for 10 minutes.
This allows the sauce to settle and makes the casserole easier to serve.
Sprinkle with fresh basil or parsley.
Serve warm.
Tips for the Best Zucchini Bake
Don’t skip salting the zucchini
This is one of the most important steps for avoiding excess liquid.
Use thick marinara
A thick, no-sugar-added marinara works better than a thin sauce for a low-carb casserole.
Shred your own cheese
Freshly shredded cheese generally melts more smoothly than heavily processed pre-shredded cheese.
Choose your beef
Lean ground beef works well, but 85/15 ground beef can give the casserole a richer flavor. Drain excess fat after browning if needed.
Let it rest
Give the casserole 10 minutes before cutting or scooping. This helps it hold together better.
ALL NUT & ALLERGEN INFORMATION
Tree Nuts
No tree nuts are required in this recipe.
The basic recipe contains:
No almonds
No walnuts
No pecans
No cashews
No pistachios
No hazelnuts
No macadamia nuts
Peanuts
No peanuts are included.
Dairy
Contains dairy from:
Cream cheese
Mozzarella
Cheddar
Parmesan
For a dairy-free version, use dairy-free cream cheese and dairy-free shredded cheese.
Gluten
The main ingredients can be naturally gluten-free, but check the labels on:
Marinara sauce
Italian seasoning
Cream cheese
Shredded cheese
For a strictly gluten-free meal, choose products labeled gluten-free.
Eggs
The basic recipe contains no eggs.
Soy
No soy is intentionally added, but packaged cheese and marinara can vary. Check labels if soy is a concern.
Fish & Shellfish
No fish or shellfish are used.
Q&A
Q: Is this recipe keto-friendly?
It can fit many low-carb or keto eating patterns, but the exact carbohydrate amount depends on the marinara, vegetables, and serving size. For a lower-carb version, choose a no-sugar-added marinara and check its nutrition label.
Q: Why is my zucchini bake watery?
The most common reason is excess moisture from the zucchini. Salt the sliced zucchini for 10–15 minutes and pat it very dry before layering. Also avoid using a very thin marinara sauce.
Q: Can I use ground turkey?
Yes. Ground turkey is an excellent substitute for beef. If using very lean turkey, you may need a little extra olive oil.
Q: Can I use ground chicken?
Absolutely. Ground chicken works well with Italian seasoning, garlic, marinara, and mozzarella.
Q: Can I use yellow squash?
Yes. You can replace some or all of the zucchini with yellow summer squash.
Q: Can I add mushrooms?
Definitely. Sauté about 8 oz (225 g) sliced mushrooms with the onion and bell pepper before adding the beef sauce.
Q: Can I make it spicy?
Yes! Add extra red pepper flakes, diced jalapeño, or use a spicy marinara.
Q: Can I make this without cream cheese?
Yes. Simply omit it and use a little extra marinara. The casserole will be less creamy but still delicious.
Q: Can I use only mozzarella?
Yes. Mozzarella alone works perfectly. The cheddar and Parmesan simply add additional flavor.
Q: Can I prepare it ahead of time?
Yes. You can prepare the beef sauce ahead and refrigerate it. For the best texture, prepare the zucchini shortly before assembling and baking.
Q: Can I freeze it?
Yes, although zucchini can become softer and release additional moisture after freezing and thawing. For the best texture, freezing is generally better before baking, with the casserole assembled in an airtight freezer-safe dish.
Q: How long do leftovers last?
Store leftovers in an airtight container in the refrigerator and use them within 3–4 days.
Q: How do I reheat it?
Reheat individual portions in the microwave or reheat the casserole gently in the oven at 350°F (175°C) until hot.
Q: What can I serve with it?
Because this is already a filling low-carb main dish, try:
Green salad
Roasted broccoli
Garlic green beans
Cauliflower mash
Sautéed mushrooms
Simple cucumber salad
Q: Can I make individual portions?
Yes. Divide the ingredients among small oven-safe ramekins or individual baking dishes and reduce the baking time, checking frequently.
Q: Can I make it without marinara?
Yes. You can use a low-carb tomato sauce or a creamy beef-and-cheese sauce instead.
Q: Is this gluten-free?
It can be. The core ingredients don’t require gluten, but always check packaged marinara, seasoning, and cheese labels for your specific dietary needs.
Q: Is it good for meal prep?
Yes. It reheats well and is convenient for make-ahead lunches or dinners.
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