Load the crockpot: Place the chicken in the crockpot and sprinkle the ranch seasoning and au jus mix evenly over the top.
Add the butter and peppers: Place the butter on top of the chicken and scatter the pepperoncini peppers around it. Pour the pepperoncini juice over everything.
Cook: Cover and cook on low for 6-7 hours or high for 3-4 hours, until the chicken reaches 165°F and shreds easily.
Shred: Shred the chicken right in the crockpot with two forks and stir it through the buttery pan juices.
Notes
This is the real, specific Mississippi combination: ranch + au jus mix + butter + pepperoncini together, not a loose approximation. Don't skip the pepperoncini brine.