01 -
Preheat oven to 400 degrees Fahrenheit and coat a baking sheet with nonstick spray.
02 -
Combine cooked meatballs and pasta sauce in a large pot over low-medium heat. Stir gently until the meatballs are fully heated and coated with sauce.
03 -
Fill each sandwich roll with 4 to 5 meatballs, topping with additional sauce from the pot.
04 -
Place the filled rolls close together on the prepared baking sheet and sprinkle each with shredded mozzarella cheese.
05 -
Bake the sandwiches in the oven until the cheese is fully melted, hot, and bubbly, approximately 10 minutes.