Preheat the oven to 375°F. Lightly spray a 9x13 baking dish with nonstick spray. Set it aside.
Keeping the rolls connected, carefully slice the rolls in half horizontally.
Remove the top row of the connected buns and carefully set it aside.
Place the bottom row of connected buns in the bottom of the baking dish.
Sprinkle 1 cup of the shredded mozzarella on top of the bottom buns.
Spread the pizza sauce over the mozzarella.
Layer 5 rows of 4 slices of pepperoni on top of the pizza sauce.
Sprinkle the remaining shredded mozzarella over the top of the pepperoni.
Lay the top row of connected buns on top of the shredded mozzarella.
Using a pastry brush, brush the melted butter on top of the buns.
Sprinkle the grated parmesan on top of the melted butter.
Sprinkle the teaspoon of dried Italian seasoning on top of the grated parmesan.
Cover with aluminum foil and bake for 25 minutes.
Remove the pan from the oven and carefully slice the rows to release the individual slider sandwiches. Serve while hot.