Preheat the Oven: Start by preheating your oven to 375°F (190°C). to ensure even cooking and perfect results. Prepare a 9×13 baking pan by lining it with aluminum foil or parchment paper to prevent sticking and make cleanup a breeze.
Prepare the Meatballs: Cook the frozen Italian meatballs according to the package instructions. Ensure they are heated thoroughly and warm before assembling the sliders. This step is crucial for even cooking during baking.
Slice the Rolls: Take the Hawaiian rolls and carefully slice them horizontally with a sharp knife, keeping the top and bottom halves intact. Place the bottom half into the prepared baking dish, ensuring they are evenly arranged.
Assemble the Sliders: Place one cooked meatball on each section of the bottom rolls, ensuring that each roll gets a meatball. Add a dollop of marinara sauce on top of each meatball to enhance flavor. Lay mozzarella cheese slices over the meatballs, covering them evenly for a gooey, melty finish.
Add the Top Rolls: Gently place the top halves of the rolls back over the meatballs and cheese. Align them carefully with the bottom rolls to maintain a neat appearance.
Prepare the Garlic Butter: In a small mixing bowl, combine melted butter with garlic salt. Mix well to create a flavorful glaze. Use a pastry brush to generously coat the tops of the rolls with this butter mixture, ensuring every inch is covered.
Bake the Sliders: Place the baking dish into the preheated oven. Bake the sliders for 13–16 minutes, or until the cheese has melted and the tops of the rolls are golden brown. The garlic butter will add a delicious crust to the rolls.
Cool and Serve: Once baked, remove the sliders from the oven and let them cool for a few minutes. Letting the sliders cool slightly will make slicing safer and more manageable. Use a sharp knife to divide the sliders into neat, individual portions for serving. Serve warm and enjoy the perfect combination of flavors!