Place chicken thighs in the bottom of the crockpot.
Add sliced carrots, chopped celery, and diced onion on top of the chicken.
Pour in the chicken broth and season with garlic powder, thyme, salt, and pepper.
Cover and cook on low for 6-8 hours or high for 4 hours.
Once the chicken is cooked through, shred it with two forks.
Prepare the biscuit dough according to package instructions.
Drop spoonfuls of biscuit dough onto the chicken mixture in the crockpot.
Cover and cook on high for an additional 30 minutes, or until dumplings are fluffy.
Stir gently before serving to combine the flavors.
Garnish with fresh parsley and enjoy!