1Remove fat from beef. Cut beef into thin strips. In 12-inch skillet, heat oil over medium-high heat. Cook beef in oil 3 to 5 minutes, stirring occasionally, until brown. Remove beef from skillet; keep warm.
2In same skillet, heat water to boiling. Break up noodles from soup mix into water; stir until slightly softened. Stir in vegetables.
3Heat to boiling. Boil 5 to 7 minutes, stirring occasionally, until vegetables are crisp-tender. Stir in contents of seasoning packet from soup mix, stir-fry sauce and beef. Cook 3 to 5 minutes, stirring frequently, until hot.