Preheat oven to 375 degrees. Flatten biscuits; layer a pepperoni slice, cheese square and another pepperoni slice on biscuit. Gather edges and pinch closed at top. Place rolls in a small greased pan. Brush tops with egg, sprinkle with Italian seasoning, garlic powder, and parmesan cheese. Bake for 20 minutes. Serve with warmed marinara sauce.
Tip: to keep the top from browning too much before baking is complete, cover with tinfoil.
Tip #2: If you prefer more filling and less dough in each roll, then cut each biscuit of dough in half lengthwise through the middle (like a hamburger bun) and make each roll using half a biscuit rather than an entire biscuit. The dough cuts best using a serrated knife (bread knife) when the dough has barely been pulled from the fridge and is still chilled. I prefer this way.