In a small bowl, stir together the salt, parsley, garlic, pepper, onion powder and paprika. Season both sides of the chicken.
Add chicken broth and butter to slow cooker, and stir to combine (mash the butter up a bit to disperse if you can).
Add the chicken to the slow cooker, overlapping only as much as necessary.
Cover and cook on low for 3 hours or until an internal temperature of 165 degrees F is reached.
If you're hoping for clean slices, remove to a cutting board and cover to keep warm. Let sit for 10 minutes before slicing.