Add the chicken broth, chicken, butter, carrots, celery, onion, pepper and salt to the slow cooker.
Cook this on low for 7 hours or on high for 3-4 hours.
Remove the chicken and shred it with a fork.
Return the chicken to the slow cooker and add the noodles to cook for another hour.
The calories shown are based on the recipe serving 10, with 1 serving being just under 2 cups of soup. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**