Preheat oven to 375F.
Pour the marinara sauce into a large saucepan over medium heat.
Add the frozen meatballs to the pot and stir until they are all coated in sauce.
Cover the pot and continue cooking the meatballs, stirring occasionally, until the meatballs are heated through. 10-15 minutes.
Slice the dinner rolls open and place the bottom buns on a parchment lined baking sheet.
Sprinkle 1 cup of the shredded mozzarella cheese over the buns.
Spoon 3 meatballs and some marinara sauce onto each of the buns.
Sprinkle the remaining cup of shredded mozzarella cheese on top of the meatballs.
Sprinkle the shredded parmesan cheese on top of the mozzarella.
Place the top buns over the cheese.
Brush the melted butter on the tops of the buns.
Sprinkle the Italian seasoning on top of the buns.
Cover the sliders with aluminum foil.
Place the baking sheet in the oven and bake the sliders until the buns are nicely toasted and the cheese is completely melted. 19 - 22 minutes.
Remove the pan from the oven and lift off the foil.
Serve and enjoy!
