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