Brown meat with vegetables in large nonstick skillet. Stir in spaghetti sauce, 3/4 cup cooking creme and 1/2 cup mozzarella: cook and stir 2 to 3 min. or until mozzarella is melted. Add pasta; mix lightly.
Spoon into 2-qt. casserole; top with remaining cooking creme and mozzarella. Cover.
Bake 20 min. or until heated through, uncovering after 15 min.