A comforting casserole that combines tender meatballs, melty cheese, tangy marinara, and a crispy garlic bread topping for a nostalgic and satisfying meal.
Use day-old bread for the topping to ensure crispiness. If bread cubes are not crisping enough, broil for 1–2 minutes watching carefully. Freshly shredded cheese melts better than pre-shredded. You can assemble the casserole ahead and refrigerate overnight before baking. Leftovers reheat best in oven or toaster oven to maintain crispiness.
Keywords: meatball sub casserole, comfort food, garlic bread topping, easy casserole, Italian meatballs, cheesy casserole