In a large nonstick skillet, cook beef and onion over medium heat until meat is no longer pink; drain. Stir in the celery, mushrooms, water, water chestnuts, soy sauce, brown sugar, bouillon granules, garlic powder and pepper. Bring to a boil. Reduce heat; cover and simmer for 15-20 minutes or until vegetables are tender.
Combine cornstarch and cold water until smooth; stir into beef mixture. Bring to a boil. Reduce heat; cook and stir for 2 minutes or until thickened. Serve over rice if desired. Top with chow mein noodles.
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