Place chicken thighs, chicken broth, onion, carrots, celery, garlic, thyme, salt, and pepper in crockpot. 2 pounds boneless, skinless chicken thighs,4 cups chicken broth,1 medium yellow onion,3 medium carrots,2 celery stalks,2 cloves garlic,1 teaspoon dried thyme,1 teaspoon salt,1/2 teaspoon black pepper.
Cover and cook on low for 5 hours until chicken is tender and shreds easily.
Remove chicken and shred with two forks. Set aside.
In a small bowl, whisk flour and cold water until smooth to make a slurry. 1/4 cup all-purpose flour,1/2 cup cold water.
Stir flour mixture into the crockpot to thicken the broth.
Return shredded chicken to crockpot and add frozen peas. 1 cup frozen peas.
In a bowl, whisk together flour, baking powder, and salt for dumplings. 1 1/2 cups all-purpose flour,2 1/4 teaspoons baking powder,3/4 teaspoon salt,3 tablespoons cold butter.
Cut in cold butter until mixture resembles coarse crumbs.
Stir in milk just until dough forms. Do not over mix. 3/4 cup whole milk.
Drop large spoonfuls of batter on top of the chicken mixture, gently pressing each into a biscuit shape for heartier dumplings. Cover and cook on HIGH for 45 minutes without lifting the lid.
Let stand 5 minutes before serving. Add fresh parsley for garnish, if desired. Chopped fresh parsley for garnish.
Notes
Pro Tip: Don't lift the lid during the final 30 minutes when the dumplings are cooking, and don't over crowd the pot! They need that steady steam to cook properly and become fluffy. Peeking will let out the steam and result in dense, heavy dumplings. Trust me on this one!