Preheat oven to 350℉ and grease a 9x13" pan with cooking spray; set aside.
Remove slider buns from their package and slice horizontally, so you have a top layer and a bottom layer.
1 12-ounce package Hawaiian Rolls
Place the bottom layer into the prepared pan.
Layer with half of the cheese, half of the pepperoni, the cooked Italian sausage, the remaining pepperoni and the remaining cheese.
2 cups shredded mozzarella cheese, 3 ounces sliced pepperoni, 8 ounces ground Italian sausage
Top the sliders with the bun tops and set aside.
Make the sauce by combining the melted butter, parmesan, garlic powder, Italian seasoning, parsley and red pepper flakes; brush it over the sliders.
1/4 cup butter, 2 tablespoons grated parmesan, 1/2 teaspoon garlic powder, 1/4 teaspoon Italian seasoning, 1/4 teaspoon parsley, 1/4 teaspoon red pepper flakes
Cover the sliders with foil and bake for 25 minutes, or until the cheese is all melted.
Serve warm with warmed pizza sauce, if desired.
pizza sauce for dipping