
Place the onion, celery, carrots, chicken, bouillon, salt, pepper and water in a Dutch oven. Bring the mixture slowly to a boil, then reduce the heat. Simmer, uncovered, for about 30 minutes until the chicken is no longer pink and the vegetables are tender.
Add the egg noodles, corn and butter to the Dutch oven; mix well. Cook, uncovered, until the noodles are tender, about 10 minutes, stirring occasionally. Serve the soup topped with celery leaves and cracked pepper if desired.