Heat the oil in a wok over medium heat. Place chicken in the wok, and cook until juices run clear. Mix in red bell pepper, and continue cooking until tender.
In a bowl, mix the broth, soy sauce, sugar, garlic, cayenne pepper, ginger, and cornstarch. Pour into the wok. Toss green onions and cilantro into wok (reserving some of each for garnish). Continue to cook and stir 5 minutes, until slightly thickened. Mix in peanuts, and garnish with reserved green onions and cilantro to serve.