Season the beef with salt and pepper and brown the meat on all sides in an oiled skillet (you can skip this step if you would like to make it easier, but it adds a lot of flavor to the roast).

Remove the meat and move to the slow cooker

Premix the Ranch and Au Jus packets, and spread over the top of the meat in the slow cooker.

Top the roast with the pepperoncini and slices of the butter

Cook on low for 8 hours or on high for 4 hours.