01 - Place chicken, diced onion, sliced carrots, sliced celery, minced garlic, dried thyme, parsley, rosemary, salt, and pepper into the slow cooker. Pour in chicken broth and dot with unsalted butter.
02 - Cover and cook on low heat for 5 hours until the chicken is tender and easily shredded.
03 - Remove the chicken from the slow cooker, shred using two forks, then return the shredded chicken back into the slow cooker.
04 - In a small bowl, whisk together flour and heavy cream until smooth. Stir the mixture into the slow cooker along with frozen peas.
05 - In a separate bowl, combine flour, baking powder, and salt. Stir in melted butter and whole milk until just combined. Fold in fresh parsley if using.
06 - Drop tablespoon-sized portions of dumpling dough onto the surface of the stew, making about 10 to 12 dumplings.
07 - Cover and cook on high heat for 1 hour, until dumplings are puffed and cooked through.
08 - Taste and adjust seasoning if necessary. Serve the stew hot.