01 - Add chicken, chicken broth, onion, carrots, celery, garlic, thyme, parsley, black pepper, salt, and butter to the slow cooker. Stir gently to combine.
02 - Cover and cook on LOW for 6 hours or on HIGH for 3 hours, until chicken and vegetables become tender.
03 - Remove chicken from the slow cooker and shred using two forks. Return shredded chicken to the pot.
04 - Stir in the heavy cream evenly into the broth.
05 - In a mixing bowl, whisk together flour, baking powder, and salt. Stir in melted butter, milk, and fresh parsley until just combined, avoiding overmixing.
06 - Drop spoonfuls (~1 tablespoon each) of the dumpling dough onto the surface of the simmering broth.
07 - Cover and continue cooking on HIGH for 30 to 40 minutes more until dumplings are fully cooked and fluffy.
08 - Ladle into bowls and garnish with additional parsley if desired. Serve hot.