1. Combine 1 tablespoon oil, soy sauce, sherry, water, cornstarch, sugar and garlic in a shallow nonmetal dish. Add the steak strips.
2. Heat remaining tablespoon oil in wok or nonstick skillet over medium-high heat. Add peppers, onion, mushrooms; stir-fry 3-5 minutes until tender-crisp. Remove and reserve.
3. Add undrained steak to wok; stir-fry 2 minutes until no longer pink. Return vegetables to wok; stir-fry to heat through. Serve over rice.