01 - Place chicken, carrots, celery, onion, garlic, chicken broth, thyme, parsley, salt, and pepper into the slow cooker and stir to blend evenly.
02 - Cover and cook on low setting for 5 hours, until chicken and vegetables are tender.
03 - Melt butter in a small saucepan over medium heat; whisk in flour and cook for 1 minute. Gradually add cream, stirring until smooth and thickened, then remove from heat.
04 - Use two forks to shred the cooked chicken directly in the slow cooker.
05 - Add the prepared cream sauce to the slow cooker and stir to combine.
06 - In a mixing bowl, combine flour, baking powder, and salt. Cut in cold butter until mixture resembles coarse crumbs. Stir in milk until just combined without overmixing.
07 - Drop tablespoon-sized portions of dumpling dough evenly over the stew in the slow cooker.
08 - Cover and cook on high for 45 to 60 minutes, until dumplings are fluffy and cooked through.
09 - Taste and adjust seasoning with salt and pepper before serving.