- Add chicken breast, celery, carrots, onion, garlic, thyme, rosemary, bay leaves, salt, rice vinegar and chicken stock to an 8-quart slow cooker. Cover with lid and cook on high for 5 hours or on low for 7-8 hours.
- Shred chicken breasts and stir back into soup. Add noodles and cook for 9-10 minutes longer or until noodles are tender.
- Ladle soup into bowls. Serve hot topped with fresh parsley and black pepper.