Sprinkle the dry ranch dressing mix evenly over the chicken, making sure to cover as much of the surface as you can. This is where a lot of the flavor and visible herbs come from.
Spoon the condensed cream of chicken soup over the top of the seasoned chicken. Spread it gently with the back of a spoon so most of the chicken is covered, but do not stir. You want everything layered rather than mixed at this point.
Dot the top of the soup layer with the pieces of butter, spacing them out so they can melt down over the chicken and sauce as it cooks.
Cover the slow cooker with the lid and cook on LOW for 6 to 7 hours, or on HIGH for 3 to 4 hours, until the chicken