SLICE beef into very thin strips. SPRAY nonstick skillet with cooking spray and heat 1 min. Add mushrooms and onion and cook until tender. Remove vegetables. Remove skillet from heat. SPRAY skillet with cooking spray. Add beef and cook until browned and juices evaporate, stirring often. ADD soup, water, mustard and vegetables and heat through. Toss rice with parsley, if desired. Serve beef over rice.
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