Sandwich rolls (cut with one side intact)
Cooked Meatballs (your favorite recipe or frozen, pre-made meatballs)
Pasta Sauce (homemade or jarred)
Spray a baking sheet with cooking spray.
Preheat oven to 400 degrees F.
Place your frozen cooked meatballs or homemade cooked meatballs in a large pot
Cover with your pasta sauce and reheat
Fill a roll with as many meatballs as you can fit (usually 4-5 meatballs)
Place filled sandwich rolls closely on baking sheet.
Top each sandwich with shredded mozzarella cheese.
Bake until cheese is melted, hot, and bubbly.