Gather all ingredients before starting the recipe
Pre heat oven to 375°F
Slice 3 hamburger buns in half.
Slice the previously cooked chicken breast into thin slices and top the bottom half of the bun with the sliced chicken.
Slice meatballs in half and top the chicken with the meatball slices and then top the meatballs with 1 tablespoon of red sauce.
Place both sides of each bun on a sheet pan. Set the top of the bun top side up and cover the buns with aluminum foil. Place sheet pan in a preheated oven for 12 minutes
Remove the sheet pan, uncover, flip the top bun over, and generously mound half of it with grated mozzarella cheese.
Preheat your broiler and return the sheet pan to the oven. Broil until the cheese is melted and bubbly and the top bun is toasted.
