Place the beef chuck roast into your slow cooker.
Sprinkle the dry onion soup mix and ranch seasoning evenly over the roast.
Add the butter and deli-sliced peperoncinis (approximately half the jar) along with 3-4 tablespoons of the juice.
Cover the slow cooker and cook on LOW for approximately 8 hours or until the beef easily shreds with a fork.
Using two forks, shred the beef and remove any excess fat.
If making sandwiches, preheat your oven to 204°C (400°F). Place the hoagie rolls on a large baking sheet, fill them with the shredded beef, and top each with a slice of provolone cheese.
Bake the sandwiches for about 2 minutes, or until the cheese is melted and the bread is toasty.