Put the chicken breasts into a greased or lined slow cooker. Add chicken broth, diced onions, chopped carrots and celery, minced garlic, kosher salt, black pepper, and bay leaves.
Cover and cook on low for 5-6 hours or on high for 3-4 hours, until fully cooked.
Discard the bay leaves. Remove the chicken and stir in the egg noodles. Cover and turn the slow cooker to high if it isn't already.
Cut the chicken into bite-sized pieces, and return it to the slow cooker. Cover and cook on high for about 20 minutes or until the noodles are tender.
Garnish with chopped fresh parsley and season with additional salt and pepper to taste.
Video
Notes
Store leftovers in an airtight container in the fridge for 2-3 days. Reheat in the microwave or on the stovetop.