After chicken has marinated, heat a wok over high heat. Add 3 tablespoons of oil and the vegetables all at once. Cook for thirty seconds stirring, and then add marinated chicken on top. Begin stirring and allowing the vegetables to cook and the chicken to get cooked. After fthree minutes of stir frying add the rice cakes. (If you add them too early they will be soggy before the chicken is done.) Continue cooking until chicken is fully cooked and vegetables and rice cake are tender, about 5 or 6 minutes more. Add scallions and cook for an additional minute.