PREP: Preheat the oven to 350°F (175°C).Generously grease a 9x13-inch baking pan.
BUTTER: In a microwave-safe bowl, melt the butter. Whisk in remaining ingredients listed under "butter."
BRUSH ON BUTTER: Carefully slice the entire block of Hawaiian Rolls in half horizontally, keeping the individual rolls attached (See Note 1). Place the bottom half of the rolls in the prepared pan. Brush 2½ tablespoons of the prepared butter mixture onto the cut sides of both the top and bottom halves of the rolls. (So you'll use a total of 5 tbsp butter here).
LAYER IN FOLLOWING ORDER: 6 slices of cheese, 12 pepperonis, pizza sauce, 12 more pepperonis, 6 remaining slices of cheese. Do not add top slab of rolls yet. Bake, uncovered, for 10 minutes.
BAKE AGAIN: Remove pan from oven and place top half of the rolls onto the sliders. Brush the top and sides of the rolls generously with the remaining butter mixture. If using, sprinkle grated Parmesan cheese on top. Cover pan with foil and bake for 20 minutes. Remove foil and bake for an additional 5-10 minutes, or until the top is golden brown and the cheese has melted.
ENJOY: Serve hot, cutting into individual sliders.
Video
Notes
Note 1: Rolls: Keep the rolls intact and slice in half horizontally:Note 2: Pepperoni: We prefer deli-sliced pepperoni. It's larger, so you'll only need about 24 pieces. If using smaller, packaged pepperonis, you'll need about 48. Feel free to adjust the quantity to your preference.