01 - Add chicken, chicken broth, onion, carrots, celery, garlic, thyme, dried parsley, black pepper, salt, and cubed butter to the slow cooker and stir gently to combine.
02 - Cover and cook on LOW for 6 hours or on HIGH for 3 hours until chicken and vegetables are tender.
03 - Remove the chicken from the slow cooker, shred with two forks, and return to the slow cooker.
04 - Stir in the heavy cream until fully combined.
05 - In a mixing bowl, whisk together flour, baking powder, and salt. Fold in melted butter, whole milk, and fresh parsley gently without overmixing.
06 - Drop spoonfuls of dumpling dough (about 1 tablespoon each) onto the surface of the simmering soup.
07 - Cover and cook on HIGH for an additional 30 to 40 minutes until dumplings are cooked through and fluffy.
08 - Ladle into bowls and garnish with extra parsley if desired. Serve hot.