Prepare the Beef: Trim excess fat from the chuck roast. Season with salt and pepper.
Optional Sear: Heat olive oil in a skillet and sear beef on all sides until browned. Transfer to crockpot.
Add Aromatics: Place onion slices and garlic into crockpot.
Add Liquid u0026 Seasoning: Pour in beef broth, pepperoncini peppers with juice, Worcestershire sauce, and dried herbs. Stir to combine.
Cook: Low: 8–10 hours (best for tenderness). High: 5–6 hours.
Shred Beef: Remove beef, shred with two forks, and return to crockpot juices.
Assemble Sandwiches: Pile beef onto Italian rolls, top with provolone, giardiniera, and roasted peppers if desired.