Preheat oven to 350 degrees. Spray a 9x13 baking dish with baking spray and place the bottoms of the bakery rolls in a single layer in the dish.
Spread the buns with 1 ½ cups of the tomato sauce before sprinkling half of the shredded mozzarella cheese over the top.
Place one meatball on each bun bottom and dollop with a bit more tomato sauce, if desired. Cover cover with the remaining shredded mozzarella cheese before placing the bun tops on top.
Brush the tops of the buns with melted butter and sprinkle with the Italian seasoning.
Cover the dish with tinfoil and bake in preheated oven for 25 - 35 minutes, or until cheese is melted and meatballs are warmed through.
Serve with extra tomato sauce for dipping, if desired.
Video
Notes
Leftover sliders can be wrapped in foil and store the fridge. To reheat simply place the entire foil packet into a 350 degree oven for 20 – 25 minutes, or until warmed through again.