HEAT oven to 350ºF.
COOK pasta in large saucepan as directed on package, omitting salt and adding vegetables to the boiling water for the last minute; drain. Return to pan.
ADD all remaining ingredients except shredded cheese to pasta mixture; mix lightly. Stir in 1/2 cup shredded cheese; spoon into 8-inch square baking dish sprayed with cooking spray. Top with remaining shredded cheese; cover.
BAKE 30 min. or until heated through, uncovering after 20 min.
