Crock Pot Pepper Steak

Ingredients:

2 Tablespoons vegetable oil

2 pounds steak, cut into 1-inch strips (round steak, flank steak or sirloin tip steak)

1 teaspoon garlic powder

salt and pepper, to taste

1 beef bouillon cube

¼ cup hot water

1 Tablespoon cornstarch

15 ounce can stewed tomatoes with juices

3 Tablespoons teriyaki or soy sauce

½ teaspoon red pepper flakes

1 teaspoon sugar

1 large green pepper, cut into strips

1 large red pepper, cut into strips

1 small yellow onion, sliced