Add the stock or broth, turkey, carrots, celery, onion, bay leaves, thyme, and pepper to the slow cooker.
Cover, and cook on low for 8 hours.
After the 8 hours are up, cook the noodles for about 1-2 minutes shy of package directions in salted boiling water on the stove top.
Once the noodles are cooked, drain.
Add the noodles to the slow cooker with the soup, and continue to cook on HIGH for about an 1½ hours more, this will soften the noodles to perfection, and make the soup thicker.