Preheat oven to 425 degrees. Cut the block of cheese into at least 28 squares. Flatten a biscuit out and stack pepperoni and cheese on top. Gather up the edges of the biscuit. Line the rolls up (seam side down) in a greased 9×13 in. pan. Brush with beaten egg. Sprinkle with Parmesan, Italian seasoning and garlic powder. Bake for 18-20 minutes. Serve the rolls with warm pizza sauce for dipping.