Combine the first 5 ingredients in a medium bowl; add chicken. Cover and marinate in refrigerator 30 minutes.
Heat oil in a large nonstick skillet over medium-high heat; add onions, ginger, and garlic. Sauté 1 minute, stirring constantly. Add chicken mixture, and sauté 2 minutes. Stir in bell peppers, lemon juice, white pepper, and salt; cook 1 1/2 minutes or until chicken is done. Serve over rice.