Preheat the oven to 400°F. Lightly spray two 9 inch circular baking dishes with cooking spray.
Cut the biscuits in half. Press each half down until it forms a circle. Make a mozzarella sandwich: one 1/2 oz piece of mozzarella between two pieces of pepperoni, then place in the centre of the biscuit round. Fold the biscuit over the “mozzarella sandwich” until it forms a ball. Place the ball in the prepared baking dish. Repeat with the remaining biscuit halves.
Sprinkle 1/2 cup of the shredded mozzarella cheese onto each baking dish, then bake in the preheated oven for 15-20 minutes, or until the biscuits are golden brown.