Place the chuck roast into a slow cooker.
Sprinkle the au jus mix and ranch seasoning over the top.
Add the butter and pepperoncini peppers.
Cover and cook on low for 8 hours, until roast is fall-apart tender.
Shred the meat using two forks, removing any large fatty pieces.
Preheat oven to 350°F. Place bottom halves of slider buns on a baking sheet.
Top each bun with shredded roast, a slice of provolone, and the top bun.
Bake for 5-10 minutes until the cheese is melted and buns are warm.
Serve warm and enjoy!