Ground Beef and Zucchini Casserole (High-Protein & Cheesy)

Name: Ground Beef and Zucchini Casserole
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Ingredients: 2 lbs zucchini (sliced into rounds); 1 tbsp avocado oil or olive oil; 1 large yellow onion (chopped); 3 cloves garlic (minced); 1 lb ground beef (I like 90% lean); Salt & pepper (to taste); 1 tsp garlic powder; 1 tsp Italian seasoning; ½ cup cottage cheese (or ricotta cheese); 14 oz can crushed tomatoes; 2 tbsp tomato paste; ½ cup broth or water; ½ cup grated or shredded parmesan cheese; 1 cup shredded Mozzarella cheese; Fresh basil (for garnish)

This ground beef and zucchini casserole is an easy, cheesy, high-protein dinner the whole family will love. This lightened-up version uses cottage cheese for creaminess and fresh zucchini for a healthier twist on classic comfort food — perfect for weeknights or meal prep!

Easy cottage cheese ground beef and zucchini casserole with melted cheese.

A Quick Look At The Recipe

✅ Recipe Name: Ground Beef and Zucchini Casserole (High-Protein & Cheesy)
🕒 Ready In: 40 minutes
👪 Serves: 6
🍽 Calories: ~386 per serving
💪 Protein: ~26g per serving
🥣 Main Ingredients: Zucchini, lean ground beef, cottage cheese, crushed tomatoes, mozzarella, parmesan, onion, garlic
📖 Dietary Info: Gluten-free, high-protein, family-friendly, meal-prep, and freezer-friendly
⭐ Why You'll Love It: A lighter lasagna-style bake that's cheesy, hearty, and never watery — perfect for busy weeknights or meal prep.

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Casseroles were the very first "real dinner" I learned how to make, and they still hold a special place in my kitchen. There's just something so comforting about pulling a bubbly, cheesy dish out of the oven and knowing you'll have leftovers for days. This ground beef and zucchini casserole is my go-to when I want that cozy, lasagna feel but in a lighter, healthier way. It's hearty, high-protein, and always a hit with friends and family.

If you've tried my Healthy Protein Mac and Cheese or Healthy Sloppy Joes, you know I'm all about simple, balanced dinners. This casserole fits right in. And just like my Juicy Thin Sliced Chicken Breast, it comes with easy tips to make sure it never turns out dry or watery. With a few little tricks, you'll have a cheesy, crowd-pleasing dinner that also reheats beautifully for meal prep.

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A Quick Look At The Recipe
Why You'll Love This Recipe
Ingredients You'll Need
Need to substitute an ingredient?
Easy Substitutions & Variations
How to Make Ground Beef and Zucchini Casserole (Step-by-Step)
1 Minute Video Tutorial
Expert Tips
Serving Suggestions
Frequently Asked Questions
Storage Tips
More Lightened-Up Dinner Recipes You'll Love
📖 Recipe
💬 Comments

⭐️⭐️⭐️⭐️⭐️

This casserole is a game-changer! The combination of lean ground beef and zucchini is not only delicious but also packed with protein. I love how the cottage cheese adds creaminess without the heaviness. It's the perfect comfort food that's still light and healthy. Can't wait to make this again!

- Saskia

Why You'll Love This Recipe

High-Protein & Filling: 26g protein per serving keeps you full and satisfied.
Easy & Quick: Ready in just 40 minutes—perfect for busy weeknights.
Cheesy Comfort: All the cozy, lasagna-style flavor without noodles.
Never Watery: Includes foolproof zucchini prep tips so it bakes perfectly.
Meal Prep Friendly: Stores for 5 days in the fridge or 3 months in the freezer.
Gluten-Free & Family-Approved: Naturally gluten-free and picky-eater friendly.

Ingredients You'll Need

All ingredients in ground beef and zucchini casserole in small bowls with labels — zucchini, lean ground beef, onion, garlic, crushed tomatoes, tomato paste, cottage cheese, parmesan, mozzarella, avocado oil, Italian seasoning, garlic powder, salt, pepper, broth, and fresh basil.

Zucchini: The key to a lighter casserole. Slice into rounds and salt or pre-roast to avoid extra water — one of the most common casserole mistakes I see people make.
Ground Beef: I prefer 94% lean, grass-fed beef for the best balance of flavor and nutrition. It keeps protein high while avoiding too much grease — just like I do in my Beef Burrito Bowls.
Onion & Garlic: Classic aromatics that build a savory, flavorful base. Let the onions soften and caramelize slightly for natural sweetness.
Crushed Tomatoes & Tomato Paste: This duo creates a rich, tangy sauce with just the right amount of body.
Cottage Cheese: My go-to swap for ricotta or heavy cream. Higher in protein and lighter in fat, it keeps the dish creamy without heaviness — the same trick I use in my Healthy Alfredo Sauce.
Parmesan & Mozzarella: The cheesy finishing touch. Parmesan adds a salty, nutty kick, while mozzarella melts into that golden, gooey topping everyone loves.
Avocado or Olive Oil: A heart-healthy fat for sautéing the aromatics.
Seasonings: Garlic powder, Italian seasoning, salt, and black pepper — simple pantry staples that tie everything together.
Broth: A splash helps loosen the sauce. I often use bone broth for an extra protein boost and depth of flavor.
Fresh Basil: Brings a burst of color and freshness that balances the richness of the cheese and beef.

Scroll to recipe card for quantities!

Easy ground beef and zucchini casserole made with cottage cheese.

Need to substitute an ingredient?

Ask AI for suggestions on how to substitute the particular ingredient.

Easy Substitutions & Variations

Make it Gluten-Free: This ground beef zucchini casserole is naturally gluten-free.
Make it Dairy-Free: For dairy-free, try almond-based ricotta and dairy-free mozzarella.
Ground Beef: Ground turkey, chicken, or even plant-based ground "meat" works well. Lentils are a great vegetarian option if you want extra fiber.
Zucchini Substitutes: Swap for yellow squash, eggplant, or even thinly sliced sweet potatoes for a heartier version.
Cottage Cheese: Use ricotta for a richer, classic lasagna-style casserole.
Mozzarella & Parmesan: Cheddar, Monterey Jack, or Gruyère will change up the flavor, but all melt beautifully.
Veggie Add-Ins: Bell peppers, chopped spinach, frozen peas, or mushrooms are easy ways to sneak in more vegetables and boost nutrition.
Quick Skillet Version: Skip layering and bake time—just cook the beef, sauce, and zucchini together in a skillet, top with cheese, and broil for 2–3 minutes.

How to Make Ground Beef and Zucchini Casserole (Step-by-Step)

Onions and garlic sautéing in a skillet with olive oil until softened and fragrant.

Step 1: Sauté onion in olive oil until softened, about 5 minutes. Add garlic and cook 1 minute.

Ground beef browning in a skillet with sautéed onions and garlic.

Step 2: Brown the ground beef, breaking it up with a spoon, 5–7 minutes. Drain excess fat if needed.

Adding crushed tomatoes, cottage cheese, parmesan, tomato paste, and broth to cooked ground beef in a skillet.

Step 3: Stir in seasonings, crushed tomatoes, tomato paste, broth, cottage cheese, and parmesan. Simmer 2–3 minutes.

Casserole dish filled with ground beef sauce mixed with half the zucchini rounds, ready for layering before baking.

Step 4: Stir in half the zucchini and spread into the dish. Top with remaining slices. Bake 15 minutes.

Adding a top layer of zucchini rounds and sprinkling mozzarella cheese over the ground beef casserole before baking.

Step 5: Remove from oven and sprinkle mozzarella on top.

Baked ground beef and zucchini casserole in a dish fresh out of the oven with golden, gooey melted cheese on top.

Step 6: Bake another 10–15 minutes, until cheese is melted and golden.

1 Minute Video Tutorial

Expert Tips

Remove the water from the zucchini. Salting for 10 minutes, then patting dry, is the best way to stop your casserole from turning watery. Don't skip this step.
Mix, then layer. Stir half of the zucchini into the beef mixture so it bakes evenly, then use the rest for the top layer. This keeps the casserole sturdy and looking pretty.
Use lean beef. Around 94% lean gives you flavor without leaving grease in the pan. If you use fattier beef, drain it before adding the tomatoes and cheese.
Let the onions cook down. Sauté until lightly golden (5–10 minutes) for natural sweetness — it makes a big difference in flavor.
Rest before slicing. Just like lasagna, a 5–10 minute rest allows the layers to set, making it easier to serve.

High-protein ground beef and zucchini casserole topped with melted cheese and fresh basil.

Serving Suggestions

Fresh salads: Light and crisp sides balance the cheesy richness. Try my kale crunch salad or my cucumber carrot salad.
Bread: Air fryer garlic bread, a warm baguette, or my healthy almond flour cornbread are perfect for soaking up the sauce.
Roasted vegetables: Air fryer broccolini, balsamic maple Brussels sprouts, or simple air fryer baby carrots add color and freshness.
Grains: Serve with rice, quinoa, or farro to make it a complete meal or for meal prep.
Cozy sides: Super crispy oven-roasted potatoes or air fryer fingerling potatoes work well if you want a heartier dinner.

Frequently Asked Questions

Can I use ground turkey or chicken instead of beef?

Yes — both ground turkey and ground chicken work. I recommend using 93% lean so the casserole stays juicy without too much grease. If using extra-lean meat, add a drizzle of olive oil to keep it moist.

How do I keep this beef zucchini casserole from getting watery?

The key is prepping the zucchini. Slice, sprinkle with salt, and let it sit for 10 minutes to draw out water. Pat dry before layering. This small step makes a big difference in keeping the casserole firm.

Can I make this ground beef and zucchini casserole ahead of time?

Yes. Assemble it up to 24 hours in advance, cover tightly, and refrigerate. When ready to serve, bake as directed — add 5 minutes if it's coming straight from the fridge.

Does this beef zucchini casserole freeze well?

Absolutely. Let it cool completely, then wrap it in layers (using plastic wrap and foil) or store it in an airtight container. Freeze for up to 3 months. For best results, thaw overnight in the fridge and reheat in the oven until warmed through.

Storage Tips

Fridge: Store in an airtight container or cover the baking dish with foil and refrigerate for up to 5 days.
Freezer: Cool completely, wrap tightly, and freeze up to 3 months.
Reheating: Bake at 350°F for 15–20 minutes or microwave slices for 1–2 minutes. Thaw overnight if frozen. Pro Tip: Slice into portions before freezing for easy reheating.

Lightened-up ground beef and zucchini casserole with cottage cheese and fresh zucchini, baked until golden and bubbly.

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Did you make this recipe?

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Comments

5 from 8 votes (1 rating without comment)