Add chicken breasts to the bottom of the slow cooker.
Sprinkle both packets of au jus gravy mix and ranch dressing mix on top of the chicken.
Then, top with stick of butter and peperoncini peppers.
Cover and cook on low for 6-8 hours. The chicken will produce its own juices so you don't have to add any other liquid to this.
When it's ready, take a couple of forks and shred the chicken.
Serve alone with sides or as a sandwich with sliced provolone cheese.