Heat oven to 375°F Spray cookie sheet with nonstick cooking spray. Unroll dough into 1 large rectangle; press perforations to seal.
Spread pizza sauce evenly over rectangle to within 1 inch of edges. Sprinkle with Parmesan cheese. Starting at short side, roll up rectangle, jelly-roll fashion. With sharp knife, cut into 16 slices. Place cut side down on sprayed cookie sheet.
Top each slice with 1 pepperoni slice and about 1 teaspoon mozzarella cheese.
Bake at 375°F for 9 to 11 minutes or until edges are golden brown and cheese is melted. (Bottoms will be very deep golden brown.).