This Keto Meatball Casserole featuring Italian-style meatballs is a simple, satisfying low-carb dinner you can make any night of the week. With only five main ingredients, it comes together quickly and is on the table in under 45 minutes.
This recipe is a fast, family-friendly dinner that works well for meal prep, weeknights, and casual gatherings.
Why this recipe works: it uses only a handful of ingredients, requires minimal hands-on time, and delivers comforting Italian flavors without the carbs from breadcrumbs or pasta. The meatball base is versatile—you can freeze extras or shape them for dishes beyond the casserole.
Why You’ll Love This Keto Meatball Casserole
- Requires only five main ingredients plus an optional cheese boost.
- Ready in under 45 minutes from start to finish.
- Family-friendly—appeals to keto and non-keto eaters alike.
- Meatballs are adaptable: make extra for meal prep or use them in other recipes.
Ingredients Needed to Make Keto Italian Meatball Casserole
Quantities are listed in the recipe card below.
- Mild Italian sausage (ground)
- Shredded Parmesan cheese
- Almond flour
- Sugar-free marinara or pasta sauce
- Mozzarella cheese
- Optional: grated Parmesan and Romano to stir into the sauce for extra flavor
How to Make Keto Italian Sausage Meatball Casserole
Below is a concise overview. For full details, see the recipe card further down.
Start by combining the ground mild Italian sausage with shredded Parmesan and almond flour. Mix gently until everything is evenly distributed, then form the mixture into roughly 1 1/2-inch meatballs.
Brown the meatballs in a nonstick skillet so they develop a nice crust on the outside—this adds flavor and helps them hold together in the casserole.
Arrange the browned meatballs in an 8 x 8-inch baking dish, spoon your sugar-free marinara over them, and sprinkle with mozzarella. If your sauce doesn’t already contain Parmesan or Romano, stir a small amount of grated cheese into the sauce for more depth.
Bake covered for a short time, then uncover to allow the cheese to melt and brown lightly. Let the casserole rest a few minutes before serving.
Recommended Sausage and Sauce Notes
Choose a mild Italian sausage you enjoy. Many commercial varieties contain a small amount of sugar; for most people that trace sugar is negligible in terms of carbs, but if you prefer a zero-sugar product, look for brands that explicitly state no added sugar.
For the sauce, pick a sugar-free marinara or low-carb pasta sauce with clean ingredients. If your chosen sauce lacks a Parmesan/Romano blend, stir about 1/4 cup of grated Parmesan and Romano into the sauce before assembling the casserole to boost flavor and creaminess.
Quick Tips
- Don’t overwork the meat when forming the meatballs—gentle mixing keeps them tender.
- Browning the meatballs first adds color and flavor; you can finish cooking in the oven.
- If you prefer a slightly thinner sauce, warm it slightly before pouring over the meatballs so it spreads evenly.
- Leftovers reheat well in the oven or microwave and make a convenient meal for the next day.
Recipe Card — Keto Meatball Casserole
Ingredients (serves 6)
- 1 lb ground mild Italian sausage
- 1/3 cup shredded Parmesan cheese
- 3 tbsp almond flour
- 24 oz sugar-free marinara or pasta sauce
- 1 cup mozzarella cheese
- Optional: 2 tbsp grated Parmesan and Romano cheese (see notes)
Instructions
- Preheat oven to 400°F (204°C).
- In a large bowl, combine the Italian sausage, shredded Parmesan, and almond flour. Mix until just combined; avoid overworking the meat.
- Form the mixture into 1 1/2-inch meatballs.
- Place the meatballs in a large nonstick skillet and cook for about 8 minutes, turning as needed until browned on all sides.
- Transfer the browned meatballs to an 8 x 8-inch baking dish. Pour the marinara over the meatballs and top with mozzarella cheese. If desired, stir the 2 tablespoons of grated Parmesan and Romano into the sauce before pouring.
- Cover the dish with foil and bake at 400°F for 15 minutes. Remove the foil and bake an additional 10 minutes, or until cheese is melted and lightly browned.
- Remove from the oven, let cool a few minutes, and serve.
Notes
- If your sauce already contains Parmesan and Romano, you can skip the optional cheese addition.
- Nutrition facts below assume the optional cheese is not added to the sauce.
Nutrition (per serving, 6 servings)
- Calories: 386 kcal
- Fat: 27 g
- Protein: 28 g
- Net Carbs: 6 g
Serving Suggestions and Related Ideas
This meatball casserole pairs nicely with a crisp green salad, sautéed low-carb vegetables, or a simple antipasto plate. For a more Italian-themed meal, serve with zucchini noodles or a side of roasted broccoli drizzled with olive oil and garlic.
Final Thoughts
This Keto Meatball Casserole is straightforward, flavorful, and adaptable. It’s a great option when you want a warm, comforting meal without the carbs from breadcrumbs or pasta. The meatballs themselves are useful beyond the casserole—make a double batch, refrigerate or freeze extras, and use them for quick lunches, sandwiches on keto-friendly bread, or a hearty soup.
Nutrition facts are provided as an estimate and may vary depending on brands and ingredient choices. Sugar alcohols have been excluded from the carb total where applicable.