Add the chicken breasts to your slow cooker. Pour in the pepperoncini juice and then add the peppers on/around the chicken. Sprinkle the chicken with the ranch and au jus seasoning, and then place the butter on top. Cover and cook for 3-4 hours on high or 6-8 hours on low.
Shred the chicken with two forks, toss with the sauce, then serve and enjoy.
