Remove rolls from package, but do not separate rolls. Cut block of rolls horizontally in half; place bottom halves of rolls in 13x9-inch baking dish sprayed with cooking spray. Spread with pizza sauce; sprinkle with half the mozzarella. Top with pepperoni and remaining mozzarella. Cover with tops of rolls.
Mix butter, Italian seasoning and garlic powder until blended; drizzle over sandwiches. Sprinkle with Parmesan; cover.
Bake 25 min. or until heated through, uncovering the last 5 min.
These easy-to-make sandwiches can be assembled ahead of time. Refrigerate up to 24 hours before baking as directed.