Chicken Stir-Fry

4 (4 ounce) boneless skinless chicken breast halves
3 tablespoons cornstarch
2 tablespoons soy sauce
1/2 teaspoon ground ginger
1/4 teaspoon garlic powder
3 tablespoons cooking oil, divided
2 cups broccoli florets
1 cup sliced celery (1/2 inch pieces) ***
1 cup thinly sliced carrots
1 small onion, cut into wedges ***
1 cup water
1 teaspoon chicken bouillon granules

***Onions are gross and Joses doesn't like celery so I am using broccoli, green peppers, carrots, sugar snap peas and water chesnuts. Use whatever vegetables your family likes.***

Cut chicken into 1/2-in. strips; place in a resealable plastic bag. Add cornstarch and toss to coat. Combine soy sauce, ginger and garlic powder; add to bag and shake well. Refrigerate for 30 minutes.
In a large skillet or wok, heat 2 tablespoons of oil; stir-fry chicken until no longer pink, about 3-5 minutes. Remove and keep warm. Add remaining oil; stir- fry broccoli, celery, carrots and onion for 4-5 minutes or until crisp-tender. Add water and bouillon. Return chicken to pan. Cook and stir until thickened and bubbly.