In a large saucepan, bring broth and 1 cup of water to a boil.
Meanwhile, very thinly slice the chicken; halve any large snap peas. Add chicken, carrots, noodles, jalapeno, and soy sauce to boiling broth mixture. Cover and cook over medium heat for 7 minutes or until chicken is cooked through and noodles are tender. Add peas and cook, covered, 3 minutes more or until peas are just tender.
Ladle into serving bowls. Sprinkle with crushed red pepper and parsley, if desired. Makes 4 servings.