Place the meatballs and marinara sauce in a saucepan, cover with a lid and cook on medium heat until hot throughout, about 10 minutes.

Cut each dinner roll in half and toast (in a toaster or oven), about 2 minutes apiece.

To serve, place 1 half-roll on a plate and place 1 meatball on top. Pour some of the sauce over it and sprinkle with a pinch of of mozzarella cheese. Top with another half-roll. Enjoy!