Season the beef chuck roast thoroughly with salt, pepper, garlic powder, and onion powder.
Heat olive oil in a large skillet over medium-high heat and sear the beef on all sides until a brown crust forms.
Place the seared beef in a slow cooker and add beef broth and Worcestershire sauce.
Cook on low heat for 8 hours or until the beef is tender and easily shreds with a fork.
Remove the beef from the slow cooker, shred into small pieces, and discard any excess fat or connective tissue.
Toss the shredded beef with barbecue sauce until evenly coated.
Preheat the oven to 350°F (175°C).
Slice the entire block of slider rolls in half horizontally and place the bottom slab in a 9x13 inch baking dish.
Distribute the pulled beef evenly over the bottom rolls and layer the provolone cheese slices on top of the beef.
Place the top half of the rolls over the cheese.
Combine melted butter, dried parsley, and garlic salt; brush the mixture generously over the tops of the rolls.
Cover with aluminum foil and bake for 10 minutes, then remove foil and bake for an additional 5-10 minutes until the cheese is melted and rolls are golden brown.