Add Chicken to the Crockpot: Place the chicken breasts at the bottom of the slow cooker.
Add Vegetables: Add the sliced carrots, chopped celery, diced onion, and minced garlic to the Crockpot with the chicken.
Pour in Broth and Water: Pour in the chicken broth and water until the ingredients are covered. Stir to combine.
Season the Soup: Add the dried thyme, rosemary, and bay leaf. Season with salt and pepper to taste.
Cook the Soup: Cover the Crockpot and cook on low for 6-7 hours, or on high for 3-4 hours, until the chicken is tender and cooked through.
Shred the Chicken: Once the chicken is cooked, remove it from the Crockpot and shred it using two forks. Return the shredded chicken to the soup.
Add Noodles: Stir in the egg noodles and cook on low for an additional 30 minutes, or until the noodles are tender.
Taste and Adjust: Taste the soup and adjust the seasoning with more salt, pepper, or herbs as needed.
Serve: Ladle the soup into bowls, garnish with fresh parsley or thyme if desired, and serve hot. Enjoy!