Please everyone at your next neighborhood potluck or football tailgate party with this scrumptious and saucy meat and cheese extravaganza! Begin by baking up some garlic bread, then simmering frozen meatballs in a rich tomato spaghetti sauce. Next, tear up the garlic bread and add to a casserole dish. Top with loads of mozzarella and Parmesan cheeses and bake until everything is gooey and melted over the garlicky toasted crust. No one will be able to resist a whole baking dish of their favorite meatball sub sandwich, deconstructed! Get the recipe for Meatball Sub Casserole.