Place the chicken breasts in the slow cooker.
Add the carrots, celery, onion, garlic, thyme, parsley, rosemary, salt, pepper, and bay leaves.
Pour the chicken broth over the ingredients.
Cover and cook on LOW for 6 to 7 hours or HIGH for 3 to 4 hours.
Remove the chicken and shred it using two forks.
Return the shredded chicken to the slow cooker.
Add the egg noodles and frozen peas.
Cover and cook for an additional 20 to 30 minutes, or until the noodles are tender.
Remove the bay leaves.
Stir in the fresh parsley.
Taste and adjust seasoning if needed.
Serve hot.