This easy Meatball Sub Casserole combines saucy meatballs, toasted bread, melted mozzarella, and Italian seasoning in one baking dish. With frozen meatballs and jarred marinara, it makes a satisfying weeknight dinner with less assembly and cleanup.
Essential Concepts
Use sturdy bread, warm the meatballs first, add mozzarella near the end, and let the casserole rest before serving.