Preheat oven to 375°F
Spray a 12-cup muffin tin with cooking spray twice
Open biscuits and rip each one into about 6 pieces with your hands or quarter them with pizza cutter
In a large bowl combine biscuit pieces, mozzarella, pepperoni, butter, marinara, garlic powder, and parsley and mix until coated
Fill each muffin cup ¾ full
Sprinkle reserved mozzarella on top of each cup
Bake 20 minutes until tops are deep golden and cheese is bubbly
Let sit 5 minutes, run a knife around the edges, pop them out
Serve with warm marinara for dipping
