Dice the onion, mince the garlic, peel and slice the carrots, and slice the celery. Add the onion, garlic, carrots, and celery to a 6 quart slow cooker or crock pot.

Remove the skin from the bone-in split chicken breasts, then place them on top of the vegetables in the slow cooker. Add the basil, parsley, thyme, bay leaf, and pepper to the slow cooker.

Pour 8 cups of water over the ingredients in the slow cooker. Place the lid on the slow cooker and cook on high for 4 hours or low for 8 hours.

After cooking on high for 4 hours or low for 8 hours, carefully remove the chicken to a cutting board and discard the bay leaf. Add the egg noodles to the slow cooker, stir to combine, and replace the lid, with the heat turned on to high.

Use two forks to remove the chicken meat from the bones, shredding the meat as you go. Return the meat to the slow cooker and stir to combine with the soup. The noodles should be tender after about 8-10 minutes of being in the soup.