Place chicken on a cookie sheet and bake 15-18 minutes at 400°. Cut rolls in half and add chicken to fit on the bottom half of each roll. Cut the chicken as needed. Top chicken with mozzarella cheese slice and add roll tops to the pan downside up.
Place pan back in the oven on broil to melt the cheese and toast the roll tops. Remove from oven and spoon pasta sauce over the cheese. Top with the other half of each roll and serve.