01 - Set oven to 300°F for braising.
02 - Rub chuck roast with olive oil, then coat evenly with salt, pepper, smoked paprika, garlic powder, and onion powder.
03 - Heat Dutch oven over medium-high heat. Sear seasoned beef on all sides until deeply browned, approximately 4-5 minutes per side. Transfer to plate.
04 - Add sliced onions and minced garlic to the pot. Cook for 2-3 minutes until fragrant and softened.
05 - Pour in beef broth, barbecue sauce, Worcestershire sauce, brown sugar, and apple cider vinegar. Stir thoroughly and bring to a gentle simmer.
06 - Return seared beef to pot, submerging partially in liquid. Cover tightly with lid and transfer to preheated oven.
07 - Cook for 4 hours, turning beef once halfway through cooking, until meat pulls apart easily with a fork.
08 - Remove beef from pot and shred using two forks. Skim excess fat from surface of cooking liquid, then return shredded beef to pot and toss to coat thoroughly.
09 - Increase oven temperature to 350°F. Slice slider buns in half and brush cut sides with melted butter. Place on baking sheet and warm for 5 minutes.
10 - Mound generous portions of pulled beef onto bottom buns. Top with 1-2 pickle slices and crown with bun tops. Serve immediately.