Slice Beef Into Very Thin Strips. Mix Cornstarch, Broth, Soy, Brown Sugar And Garlic Powder Until Smooth. Set Aside. Stir-Fry Beef In Nonstick Skillet Over Medium-High Heat Until Browned And Juices Evaporate. Add Broccoli And Cook 1 Minute. Stir Cornstarch Mixture And Add. Cook Until Mixture Boils And Thickens, Stirring Constantly. Serve Over Rice.