Cut as much fat off the pork butt as possible. Place in 6 quart slow cooker.
Sprinkle the ranch seasoning and Au Jus gravy seasoning over the pork butt.
Drizzle the peperoncini juice over the pork butt.
Scatter the peperoncini peppers around the pork butt and scatter the butter on top.
Cover and cook on LOW for 9 hours.
Skim any fat off the surface and shred the meat. Remove any areas of fat as you shred the meat.