Spray the bottom of a 7-quart (or larger) slow cooker with cooking spray.
Arrange chicken breasts, sliced carrots, diced onions, sliced celery, minced garlic, thyme, rosemary, and bay leaves in the slow cooker.
Pour chicken broth over the ingredients. Cover and cook on low for 6 hours (or on high for 4 hours).
Remove chicken breasts to a plate and shred with two forks. Season with salt and pepper to taste. Cover the shredded chicken with plastic wrap and set aside.
Add egg noodles to the crockpot. Cover and cook on high for an additional 2-3 minutes.
Incorporate the shredded chicken and chopped parsley back into the soup.
Stir well and serve with crusty bread.