Spray your crock pot with nonstick cooking spray or use a crock pot liner.
Place the chicken in the bottom of the crock pot. Pour in the chicken broth.
In a bowl, combine the cream of celery soup, cream of chicken soup, sour cream, salt, pepper, sage, onion powder, garlic powder, and parsley flakes. Whisk together until smooth. (I recommend whisking these separately rather in the crock pot to get the mixture completely smooth)
Pour the soup mixture over the chicken.
Cover and cook on LOW for 4½ hours.
If you'd like to shred your chicken, do that now. You can shred it directly in the crock pot or remove it and shred it with two forks.
Add the frozen Amish noodles and frozen mixed vegetables.
Cover and continue cooking on LOW for 1 hour, or until the noodles are plump and tender.
Give everything a good mix to coat the noodles in the creamy sauce and serve warm.