Cut chicken into 1/2" pieces. Place in a bowl; stir in soy sauce and sherry. Let stand 30 minutes. Spray a cold wok or large skillet with vegetable cooking spray; preheat over medium-high heat. Add onion, stir-fry 2 minutes. Add peppers, stir-fry 1 minute. Add mushrooms, stir-fry about 1 minute more or till veggies are crisp-tender. Remove veggies from wok; set aside.

Drain chicken, reserving the marinade. Add oil to wok. Add gingerroot; stir-fry 15 seconds. Add half the chicken, stir fry 3-4 minutes till no longer pink. Remove. Stir-fry remaining chicken 3-4 minutes till no longer pink. Return all chicken, veggies, and bamboo shoots to wok; push from center of wok.

Stir broth, cornstarch, and 1/4 t pepper into reserved marinade; add to wok. Cook and stir till slightly thickened; toss gently to coat chicken mixture. Serve while hot. Per serving: 204 calories, 30 g protein, 7 g carbohydrates, 6 g fat, 73 mg cholesterol, 613 mg sodium, 621 mg potassium.