Cook noodles to desired doneness as directed on package. Drain.
Meanwhile, heat oven to 350°F. Grease 2 1/2-quart casserole. In small bowl, combine sour cream, soup, onion and pepper.
In greased casserole, combine cooked noodles, vegetables and ham. Pour soup mixture over noodle mixture; blend well. In small bowl, combine cornflake crumbs and melted margarine; mix well. Sprinkle evenly over casserole.
Bake at 350°F. for 30 to 35 minutes or until bubbly.