01 - Place chicken, onion, carrots, celery, garlic, thyme, parsley, rosemary, salt, and pepper into the slow cooker. Pour in chicken broth and dot with butter.
02 - Cover and cook on low heat for 5 hours or until chicken is very tender.
03 - Remove chicken from slow cooker and shred using two forks, then return shredded chicken to the slow cooker.
04 - Whisk flour and heavy cream until smooth in a small bowl, then stir the mixture and frozen peas into the slow cooker contents.
05 - In a separate bowl, combine flour, baking powder, and salt. Stir in melted butter and milk until just combined; gently fold in parsley if using.
06 - Drop tablespoon-sized dollops of dumpling dough onto the surface of the stew, approximately 10 to 12 dumplings.
07 - Cover and cook on high for 1 hour or until dumplings are puffed and cooked through.
08 - Taste and adjust seasoning if needed. Serve immediately while hot.