I’ve found that using fully cooked frozen meatballs, like Kraft Natural Chefs' Select, along with a quality marinara sauce such as Prego, makes this recipe super convenient without sacrificing flavor. When making meatball subs, heating the meatballs gently in the sauce ensures they stay juicy and perfectly coated. Baking them with shredded low-moisture part-skim mozzarella cheese melts beautifully, giving the sandwich that classic gooey texture. For added texture and nutrition, I like to throw in sliced bell peppers or onions either raw for crunch or lightly sautéed if I prefer them softer. Sub rolls or hoagie buns are ideal because they hold up well to the saucy filling without getting soggy. Serving these subs with a simple green side salad balances the meal nicely, but crispy chips also make a tasty accompaniment if you’re in the mood for something more indulgent. This recipe is very versatile, and using beef, turkey, or even vegetarian meatballs works equally well, allowing you to customize based on your dietary preferences. Overall, this easy meatball sub recipe is a lifesaver on busy days when you want something flavorful, filling, and fuss-free to prepare. Give it a try for lunch or dinner, and feel free to experiment by adding your favorite sandwich toppings or hot sauce for an extra kick!