Heat the oil in a large soup pot over moderate heat and saute the chicken breast halves until light golden brown on both sides. Remove the chicken breasts and set aside. Add the onion, carrot, and celery to the same pot and saute for five minutes.
Meanwhile, slice, shred, or coarsely chop the chicken meat. Add the stock, thyme, salt, pepper, and chicken meat to the pot. Bring to a boil over high heat, reduce the heat, and simmer covered until the vegetables are tender, 10 to 15 minutes.
Stir in the noodles and simmer just until they are tender, about 8 minutes. Serve immediately, garnished with chopped parsley if desired. Serves 6 to 8.
Reproduced by permission of Worldwide Recipes.