Heat a large cast-iron skillet or wok over high heat. Add 1 tablespoon oil; swirl to coat. Add chicken in a single layer; cook 4 minutes or until browned, stirring after 2 minutes. Add ginger, garlic, and salt; stir-fry 30 seconds. Remove chicken mixture to a plate.
Add remaining 1 tablespoon oil to pan; swirl to coat. Add mushrooms; stir-fry 2 minutes. Add sherry; cook 1 minute. Add green beans, chicken stock, soy sauce, and oyster sauce; cook 3 minutes or until beans are thoroughly heated. Add noodles and chicken to pan; cook 1 minute or until noodles are heated and chicken is done, tossing to coat with sauce.