1 pkg. (12 oz.) VELVEETA Shells & Cheese Dinner
1 lb. lean ground beef
1 green pepper, chopped
1 small onion, chopped
1 cup Pizza Sauce
1/2 cup KRAFT Shredded Low-Moisture Part-Skim Mozzarella Cheese
Pre-heat oven to 375*
Prepare Dinner as directed on package. While Macaroni is cooking, brown meat with peppers and onions in large skillet; drain. Stir in pizza sauce.
Spoon Dinner into 8-inch square baking dish; top with meat mixture and mozzarella. Cover.
Bake 20 min. or until heated through.