Remove the visible fat on the outside of the meat and any you see between the muscles.
Rub most of the oil over it and grind over some salt and black pepper.
Heat a skillet over a moderate heat, then add the rest of the oil.
Brown the roast in there on all sides.
Transfer the chuck roast into your slow cooker and set the temperature to low.
Now dissolve the beef bouillon powder in 1/3 cup of boiling water.
Pour this over the roast.
Sprinkle most of the ranch seasoning powder on top and dot with butter.
Arrange the pepperoncini on top.
Cook for 6 to 8 hours on low, or until you can pull the meat apart using a fork.
Stir the remaining ranch seasoning into the juices and cook for 5 minutes more.
Serve this keto pot roast with your favorite side dishes.