Arrange chicken breasts, carrots, celery, onion, fresh thyme, bay leaves, chicken soup base, granulated garlic, salt, lemon pepper, poultry seasoning and black pepper in the bottom of the slow cooker.
Pour the chicken broth over the vegetables. Stir to combine.
Lock the lid in place and cook on low for 6-8 hours or on high for 3-4 hours.
Meanwhile, about 30 minutes before the end of cooking, cook the egg noodles in salted water per the package instructions until al dente, then drain.
Uncover the soup and use 2 forks to shred the chicken breasts. Add the drained egg noodles, stir to combine. Remove the bay leaves and thyme stems.
Simmer on high for 5-10 minutes, then ladle into bowls and serve garnished with chopped parsley.