Lightly grease the inside of your crockpot with cooking spray or olive oil.

Place your chuck roast directly in the bottom of the slow cooker.

Sprinkle the ranch dressing mix evenly over the top of the meat.

Do the same with the brown gravy mix.

Layer 10 to 12 pepperoncini peppers over the roast and pour in about 1/4 cup of their juice.

Place half a cup of butter (one stick) right on top of everything.

Cover and cook on low for 8 to 10 hours or on high for 6 to 7 hours.