Easy Cheesy Keto Meatball Casserole

Lunch, Poultry

March 10, 2026

Your New Favorite Weeknight Hero: The Ultimate Meatball Casserole

Remember those classic, messy, absolutely delicious meatball subs? What if I told you that you could get all that comforting, saucy, cheesy goodness in a simple, low-carb casserole? This recipe is your weeknight hero. By using pre-made freezer meatballs, you get straight to the good part: bubbling marinara, tender meatballs, and a glorious blanket of melted mozzarella and Parmesan. Serve it with keto-friendly buns for the full sub experience, or spoon it over zoodles for a lighter meal. Let’s get cooking!

Ingredients

• 1 recipe marinara sauce, olive oil omitted
• 1/2 cup / 120 ml bone broth or chicken stock
• 1/2 recipe Make-Ahead Freezer Meatballs, approx. 32 meatballs
• 1 1/2 cups / 170 g / 6 oz shredded mozzarella cheese
• 1 cup / 90 g / 3.2 oz grated Parmesan cheese
• Salt and pepper, to taste
• Fresh basil, for garnish
• Sourdough Keto Buns or zoodles, for serving

Instructions

1. Prepare the marinara sauce according to its recipe, omitting the olive oil to prevent the final dish from becoming too greasy.2. Heat a large, oven-safe skillet or a casserole dish over medium heat. Add the marinara sauce, broth, and meatballs.3. Bring the mixture to a boil, then cover, reduce heat to low, and simmer. Cook for 10-12 minutes if using fresh meatballs, or up to 20 minutes for frozen meatballs.4. Remove the lid and continue to cook for another 5 minutes, allowing the sauce to thicken slightly.5. Preheat your broiler to high. Sprinkle the mozzarella and Parmesan cheese evenly over the meatballs.6. Place the skillet under the broiler and cook until the cheese is melted, bubbly, and lightly golden, about 5 minutes. Keep a close eye on it to prevent burning.7. Carefully remove from the oven. Season with salt and pepper to taste, garnish with fresh basil, and serve immediately.

Nutritional Information

• Recipe Facts & Nutrition
• MAKES: 8 servings (4 meatballs each)PREPARATION TIME: 15 minutesCOOKING TIME: 30 minutes
• NUTRITION FACTS PER SERVING:
• Energy: 443 kcal
• Net carbs: 3.6 g
• Protein: 31.8 g
• Fat: 32.5 g
• Macronutrient ratio: Calories from carbs (3%), protein (29%), fat (68%)

Pro Tips

• Use a cast-iron or other oven-safe skillet to go from stovetop to broiler, saving an extra dish.
• For a richer flavor, use beef bone broth instead of chicken stock.
• Ensure meatballs are in a single layer so they heat through evenly in the sauce.
• Let the casserole rest for 5 minutes after broiling; this allows the cheese and sauce to set, making it easier to serve.

FAQ

Q: Can I use frozen meatballs for this casserole
A: Yes, this recipe is designed to be made easily with pre-made freezer meatballs. Just be sure to simmer them in the sauce for up to 20 minutes to ensure they are heated through completely before adding the cheese.

Q: What should I serve with this low-carb meatball casserole
A: To keep the meal keto-friendly, serve the casserole with Sourdough Keto Buns for a classic meatball sub experience, or spoon it over zoodles for a lighter option.

Q: How do I make this recipe in one pan
A: For easy cleanup, use a large, oven-safe skillet (like a cast-iron pan). This allows you to cook the casserole on the stovetop and then transfer it directly under the broiler without needing a separate baking dish.

Q: How do I prevent my meatball casserole from being too greasy
A: The recipe recommends omitting the olive oil when you prepare the marinara sauce. This simple step helps prevent the final dish from becoming overly greasy from the combined fats.

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