Add the chicken thighs, sliced sausage, onion, carrots, and celery to the slow cooker.
Pour in the chicken broth and stir in the smoked paprika, garlic powder, salt, and black pepper.
Cover and cook on low for 6 hours until the chicken is tender.
In a mixing bowl, stir together the flour, baking powder, milk, and melted butter to form a thick batter.
Shred the chicken in the slow cooker with two forks, then drop spoonfuls of the batter over the top of the stew.
Cover and cook on high for 1 more hour until the dumplings are cooked through.
Sprinkle with chopped parsley before serving.