Place the chicken breasts in the crockpot.
Pour in the cream of chicken soup and chicken broth.
Add the frozen mixed vegetables.
Season with garlic powder, onion powder, thyme, salt, and pepper.
Stir the mixture gently to combine.
Cover and cook on low for 6-8 hours or high for 3-4 hours.
Prepare the biscuit dough about 30 minutes before serving.
Drop spoonfuls of biscuit dough onto the chicken mixture.
Cover and cook for an additional 30 minutes until dumplings are fluffy.
Garnish with fresh parsley before serving.