In a large saucepan heat marinara sauce, add meatballs to heat through. Add meatball slices to bottom bun, add good layer of cheese,,, sprinkle lightly with italian seasoning and put under broiler just until cheese melts, only 1 or 2 minutes.. Top with top bun, press and serve with extra sauce for dipping.
https://cookpad.com/us/recipes/366612-simple-basic-marinara-sauce