Set your oven to 350°F to ensure it’s nice and hot when your sliders are ready to bake.
Place the Hawaiian rolls onto a baking sheet or dish. Using a sharp knife, cut a small circle out of the center of each roll. Push the cut-out piece down into the roll to create a little pocket.
Melt the butter in a small bowl, then use a silicone brush to generously coat the rolls inside and out. Sprinkle garlic powder over the buttered rolls for that irresistible garlic bread flavor.
Assemble the Sliders: Sprinkle a little shredded mozzarella into each roll’s pocket.
Gently press a meatball into the pocket.
Spoon marinara sauce over each meatball.
Top with the remaining shredded mozzarella.
Sprinkle grated Parmesan and dried parsley flakes over the tops of the rolls for extra flavor and a pop of color.
Place the baking dish in the oven and bake for 18-20 minutes, or until the cheese is melted and bubbly.