Place the chicken breasts in the bottom of your Crockpot.
Add the carrots, celery, onion, garlic, thyme, parsley, salt, and pepper.
Pour in the chicken broth, ensuring everything is covered.
Cover and cook on low for 6-7 hours or high for 3-4 hours, until the chicken is cooked through.
Remove the chicken and shred it with two forks.
Return the shredded chicken to the Crockpot.
Add the egg noodles and cook on high for 20-25 minutes, until noodles are tender.
Serve hot, garnished with fresh parsley if desired.