Spray waffle maker with cooking spray; heat waffle maker.
Separate dough into 8 biscuits. Cut slit on 1 side of each biscuit, forming a deep pocket. Place 1 slice of cheese into each pocket. Top cheese with 6 or 7 pepperoni slices. Press dough around edge to seal each biscuit.
Place 1 biscuit on center of waffle maker. Close lid; cook 3 minutes or until waffle is golden brown. Repeat with remaining filled biscuits. Serve with pizza sauce.