Mushroom Zucchini Chicken

1.5 lbs chicken, diced
4 tablespoons cornstarch
4 tablespoons olive oil
1 cup mushrooms, stemmed and quartered
2 medium zucchini, quartered and sliced
1/2 medium brown onion, quartered and sliced
3 tablespoons soy sauce
1 teaspoon balsamic vinegar
1 tablespoon seasoned rice vinegar
2 garlic cloves, pressed
1 inch ginger, peeled, grated with microplane

1. Heat 3 tablespoons oil in large skillet. Dredge chicken with cornstarch. Cook in skillet until golden.
2. Remove chicken from skillet. Add 1 tablespoon oil to skillet and cook mushrooms, zucchini and onion about 4 minutes.
3. While vegetables are cooking, combine remaining ingredients in small mixing bowl.
4. Add sauce to vegetables, toss to coat. Add chicken back into skillet, combine. Serve over steamed rice.