In a large skillet, cook the beef, onion and celery over medium heat until meat is no longer pink, breaking it into crumbles; drain. Stir in the soup, bean sprouts, soy sauce and pepper. Bring to a boil. Pour into a greased 13x9-in. or 3-qt. baking dish. Stir in rice and water chestnuts.
Cover and bake at 350° for 30 minutes. Uncover; stir in peas and sprinkle with noodles. Bake until heated through, 15-20 minutes longer.