12 small frozen meatballs, such as Cooked Perfect (or check out our five-ingredient meatball recipe)
1/4 cup marinara
4 slices mozzarella
4 slider buns
Cook meatballs according to package instructions. Once meatballs are cooked, remove from oven and separate meatballs into groups of 3. Place mozzarella over groups of 3 small meatballs, and broil 2 minutes or until cheese melts. Heat sauce in a small pan on medium-low heat until warm. Top slider buns with meatballs and mozzarella, then sauce.