Step 1

Preheat oven to 350°F. Warm rolls in oven, 5 to 10 minutes. Slice off and discard ends of each roll. Cut rolls in half lengthwise.

Step 2

Drizzle cut sides of top and bottom roll halves with olive oil and rub with clove of garlic until fragrant. Arrange bottom roll halves on a baking sheet, cut side up. Spoon a generous layer of tomato sauce onto each of the bottom halves.

Step 3

Slice meatballs in half and arrange on sandwiches, overlapping as necessary for even coverage. Spoon more tomato sauce on top of meatball halves and grate Parmesan all over.

Step 4

Lay sliced mozzarella on top of meatballs. Transfer baking sheet to oven and bake until mozzarella is fully melted, about 4 minutes; warm roll top halves in oven for last minute of cooking.

Step 5

Close sandwiches and serve immediately.