In large nonstick skillet, heat vegetable oil over medium heat 1 minute. Add chicken and cook 6 minutes or until lightly browned, stirring occasionally. With slotted spoon, remove chicken from pan.
Increase heat to medium-high. Add bell pepper and yellow onion, and cook 2 minutes, stirring frequently. Stir in mushrooms, garlic and ginger, and cook 3 minutes. Return chicken to skillet. Stir in green onions and soy sauce, and cook 3 minutes longer. Remove skillet from heat and stir in sesame oil. Serve stir-fry over rice.
Approximate nutritional values per serving: 339 Calories, 7g Fat (1g Saturated), 66mg Cholesterol, 382mg Sodium, 38g Carbohydrates, 3g Fiber, 32g Protein