Best Beef and Broccoli

3 tablespoons cornstarch, divided
1/2 cup water, plus
2 tablespoons water, divided
1/2 teaspoon garlic powder
1 lb boneless round steak or 1 lb charcoal chuck steak, cut into thin 3-inch strips
2 tablespoons vegetable oil, divided
4 cups broccoli florets
1 small onion, cut into wedges
1/3 cup reduced sodium soy sauce
2 tablespoons brown sugar
1 teaspoon ground ginger
hot cooked rice

How to make it :
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.