PREHEAT oven to 375°F. Unroll 1 pizza crust onto greased baking sheet. Gently stretch crust to 12x10-inch rectangle.
SPREAD crust evenly with pizza sauce to within 1 inch of edge of crust. Sprinkle with half of the mozzarella cheese, pepperoni and remaining mozzarella cheese. Reserve 1 Tbsp. Parmesan cheese; sprinkle remaining Parmesan cheese over mozzarella cheese. Top with second pizza crust; crimp edge with fork to seal. Sprinkle with reserved 1 Tbsp. Parmesan cheese.
BAKE 25 to 30 minutes or until evenly browned. Let stand 5 minutes before cutting. Serve with additional heated pizza sauce, if desired.
Great Substitute: Substitute chopped fresh vegetables, such as green pepper, red pepper, broccoli or onion for the pepperoni.