1 chuck roast (2 ½ to 3 lbs)
1/2 jar pepperoncini (12 oz)
1/2 jar pepperoncini juice (12 oz)
1 (1 ounce) packet au jus gravy mix
1 (0.4 oz) package buttermilk ranch dressing (such as Hidden Valley(R))
salt and ground black pepper to taste
Combine chuck roast, pepperoncini, pepperoncini juice, au jus mix, buttermilk ranch dressing, salt, and pepper in a slow cooker. Cook on Low until roast is fork-tender, about 8 hours. Pull chuck apart with 2 forks. Cover with aluminum foil to keep warm.