Ground beef or pork meatballs, marinara sauce, mozzarella cheese, Parmesan cheese, garlic, Italian seasoning, and breadcrumbs.
Pre-cook the meatballs by baking or pan-frying until browned and fully cooked.
In a casserole dish, layer marinara sauce, cooked meatballs, more sauce, mozzarella, and a generous sprinkle of Parmesan.
Bake the assembled casserole at 375°F (190°C) for 20–25 minutes until the cheese is bubbly and golden brown.
Add sautéed onions, bell peppers, or fresh basil for extra flavor and texture.
Serve with garlic bread, pasta, or a side salad for a complete meal.
Leftovers can be refrigerated for up to 3 days or frozen for up to 2 months—reheat before serving.