Preheat the oven on the broiler setting at 400 degrees. In a microwave safe dish heat the meatballs and marinara sauce. Slice your roll lengthwise. Spoon on the meatballs and cover with any remaining marinara sauce. Arrange the sliced cheese on top . Place the sandwich, open faced, on a cookie sheet and place under the broiler . Broil until the cheese is melted and the edges of the roll is brown and crispy. DIG IN! … make sure you have some napkins!.
