In a large non-stick skillet, stir in the vegetables and heat for about 3 minutes. Add water and garlic powder and reduce heat. Cover the vegetables and cook for about 7 minutes, until tender but firm.
In a small bowl, blend soy sauce, cornstarch, and ginger. Push vegetables to one side of the pan and add the sauce to the broth already in the pan and stir. Cook for 1 minute.
Add cooked chicken. Gently stir together vegetables, thickened broth and chicken and cook until it is heated through.
Note: When more vegetables are used, remember to add a bit more water to the pan.