In a small bowl, stir together the salt, parsley, garlic powder, pepper, onion powder, and paprika. Season both sides of the chicken.
Pour the chicken broth into a 4- to 6-quart slow cooker and add the chicken breasts.
Cut the butter into small pieces and place on top.
Cover and cook on low for 3 hours, or until a meat thermometer inserted into the chicken reaches 165°F.
For clean slices, remove the chicken to a cutting board and cover to keep warm. Let rest for 10 minutes before slicing.
