Not yo' mamas meatball sub! We've added pepperoni and lots of mozzarella, turning this classic into an irresistibly hearty eat.
Preheat oven to 400 degrees. In a large pot, heat olive oil over medium-high heat. Add garlic, sugar, tomatoes, Italian Seasoning, red pepper flakes, meatballs, pepperoni, and salt. Heat until meatballs are warmed through. Spoon meatballs into the bottom half of each sub roll. Top each with 3 slices of mozzarella. Place in preheated oven and bake until the mozzarella is barely browned, about 13-17 minutes. Remove from oven, sprinkle fresh basil over the top of the sub rolls. Serve and enjoy!