PREHEAT oven to 375°F. Unroll 1 of the pizza crusts onto baking sheet. Gently pat out crust to 12x10-inch rectangle; spread evenly with the pizza sauce to within 1 inch of edges of crust.
SPRINKLE with half of the mozzarella cheese, the vegetables and remaining mozzarella cheese. Reserve 1 Tbsp. of the Parmesan cheese; sprinkle remaining Parmesan cheese over mozzarella cheese. Top with second pizza crust; crimp edges with fork to seal. Sprinkle with the reserved Parmesan cheese.
BAKE 25 to 30 min. or until golden brown. Let stand 5 min. before cutting into 8 pieces to serve.