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MIX soy sauce and cornstarch until well blended; set aside.
HEAT oil in large skillet on medium-high heat. Add steak; cook and stir 2 to 3 minutes or until steak is no longer pink. Add soy sauce mixture, vegetables and beef broth; bring to boil. Reduce heat to medium-low.
STIR in steak sauce; simmer 2 minutes or until heated through.