Cantonese in origin, moo goo gai pan is an Americanized version of a pre-existing Chinese stir-fry made with mushrooms and sliced chicken as the main ingredients. Additional ingredients typically include snow peas, bamboo shoots, water chestnuts, and bok choy, all doused in a simple white sauce made with chicken broth and seasoned with soy sauce, oyster sauce, and sometimes Shaoxing wine.