HEAT oven to 375°F.
UNROLL 1 pizza crust onto greased baking sheet; pat to 12x10-inch rectangle.
SPREAD with pizza sauce to within 1 inch of edges; top with half the mozzarella, pepperoni and remaining mozzarella. Reserve 1 Tbsp. Parmesan; sprinkle remaining Parmesan over mozzarella. Cover with second pizza crust; crimp edges with fork to seal. Sprinkle with reserved Parmesan.
BAKE 25 to 30 min. or until evenly browned. Let stand 5 min. before cutting to serve.