To your slow cooker add the chuck roast, ranch packet, au jus packet, ¼ cup butter, ½ cup sliced pepperoncini peppers, and pepperoncini pepper juice.
Cook on high for 6 hours or low for 8 hours.
Shred the meat and remove any visible fat.
Preheat your oven to 350 degrees.
Grease a 9x13 baking dish.
Slice your rolls in half and place the bottom layer of the rolls in the baking dish.
Layer 6 slices of provolone.
Next pile on all that shredded meat.
Top with the remaining cheese and ¼ cup sliced pepperoncinis.
Place on the top half of the rolls.
Melt your 2 tablespoons of butter and stir in the garlic salt and parsley.
Brush the tops of the rolls with the melted butter mixture.
Place in oven and bake for 15 minutes or until the tops are golden brown and the cheesy melted.
Serve!