Preheat oven to 450 degrees.
Heat meatballs in spaghetti sauce according to package directions.
Smear spaghetti sauce evenly across the french bread. Cut meatballs in half and place over spaghetti sauce.
Top the meatballs with mozzarella cheese. Place in the hot oven for 10 to 15 minutes or until the cheese is melted.
Slice diagonally and serve.