Add chicken, carrots, celery, garlic, onions, bay leaves, salt, pepper, and crushed thyme/rosemary/celery seed to the crock pot.
Pour in chicken stock, mix, and cook on low for 5½ hours. Remove chicken, cool for a few minutes, and cut into bite-sized pieces. Return chicken to the crock pot and cook until vegetables are tender-crisp (30-60 minutes).
Cook egg noodles separately. To serve, place noodles in a bowl and ladle soup over them. Alternatively, add noodles to the crock pot for the last 15 minutes if no leftovers are expected. The pasta will absorb the broth when stored.