Heat the Oven: Begin by setting your oven to 350°F (175°C) and allow it to preheat. This ensures even cooking and the perfect texture for your sliders. To prevent sticking, butter a 9×13 baking dish or line it with parchment paper. Set it aside while preparing the sliders.
Prepare the Rolls: Carefully slice the Hawaiian rolls in half horizontally, keeping the rolls intact as a single sheet. This makes assembly easier and ensures even layers. Place the bottom halves of the rolls into the prepared baking dish, making sure they fit snugly.
Assemble the Sliders: Take your cooked meatballs and place one on each roll, aligning them neatly. Using a spoon, add a generous amount of marinara sauce over each meatball, ensuring they are well-coated. Sprinkle the shredded mozzarella cheese evenly over the meatballs, covering each one for a gooey, cheesy finish.
Prepare the Butter Mixture: In a small bowl, combine the melted butter, Italian seasoning, garlic powder, and grated Parmesan cheese. Stir well until all the ingredients are thoroughly mixed, creating a flavorful glaze for the rolls.
Top and Butter the Rolls: Place the top halves of the rolls over the assembled meatballs and cheese, aligning them carefully. Pour the butter mixture evenly over the tops of the rolls, using a pastry brush to ensure complete coverage. This step not only adds flavor but also helps the rolls achieve a golden, glossy finish.
Bake the Sliders: Cover the baking dish with aluminum foil, ensuring it’s loosely tented to avoid sticking to the rolls. Place the dish in the preheated oven and bake for 12 minutes to allow the cheese to melt. Remove the foil and continue baking for an additional 5–7 minutes, or until the tops of the rolls are golden brown and slightly crisp.
Cool and Serve: Once baked, remove the dish from the oven and let the sliders cool for a few minutes. This helps the layers set and makes them easier to handle. Carefully slice the sliders into individual portions using a sharp knife. Serve them warm to savor the delightful blend of flavors and textures!