This is the best-tasting easy beef and broccoli stir-fry.
In a bowl, combine 2 tablespoons cornstarch, 2 tablespoons water and garlic powder until smooth.
Add beef and toss.
In a large skillet or wok over medium high heat, stir-fry beef in 1 tablespoon oil until beef reaches desired doneness; remove and keep warm.
Stir-fry broccoli and onion in remaining oil for 4-5 minutes.
Return beef to pan.
Combine soy sauce, brown sugar, ginger and remaining cornstarch and water until smooth; add to the pan.
Cook and stir for 2 minutes.
Serve over rice.
Courtesy of http://www.food.com/recipe/the-best-easy-beef-and-broccoli-stir-fry-99476