Place chicken in the bottom of the crock pot and layer with butter, onion, garlic, carrots, and celery.
In a bowl, mix chicken broth, cream of chicken soup, poultry seasoning, salt, and pepper. Pour over the ingredients in the crock pot.
Cover and cook on low for 6 hours or high for 3 hours.
Remove the chicken, shred it, and return it to the pot.
Cut biscuits into quarters, add to the crock pot, and submerge in the liquid.
Cover and cook on high for an additional hour or until dumplings are fluffy.
Stir gently before serving.