Hearty and satisfying, easy Meatball Sub Sandwiches are simple to make in just 20 minutes. A family favorite and great way to use up leftover meatballs.
Add the meatballs and marinara sauce to a large skillet over medium high heat. Cover and cook until the meatballs are heated through, approximately 10 minutes.
While the meatballs cook, slice the rolls in half lengthwise but do not cut all the way through so the roll opens like a book.
Spread the garlic bread spread over the cut sides of the rolls and arrange on a baking sheet so the cut side is facing up.
Broil the rolls under a broiler set to high for 1-2 minutes until golden.
Remove from the oven and top each of the rolls with two slices of provolone cheese.
Fill the rolls with 3 meatballs in each roll and sprinkle with the mozzarella cheese.
Return the sandwiches to the oven and broil until the cheese is melted.
Sprinkle with the parmesan cheese and serve immediately with peppers or hoagie spread, if desired.