01 - Preheat oven to 300°F.
02 - Rub the beef with olive oil, salt, pepper, smoked paprika, garlic powder, and onion powder.
03 - Heat a large Dutch oven over medium-high heat. Sear the beef on all sides until browned, about 4–5 minutes per side. Remove and set aside.
04 - In the same pot, add sliced onion and garlic. Sauté for 2–3 minutes until softened.
05 - Pour in beef broth, barbecue sauce, Worcestershire sauce, brown sugar, and apple cider vinegar. Stir and bring to a simmer.
06 - Return the beef to the pot, nestling it into the liquid. Cover and transfer to the oven.
07 - Braise for 4 hours, turning the beef once halfway, until fork-tender and shreddable.
08 - Remove beef from the pot and shred using two forks. Skim excess fat from the braising liquid, then return shredded beef to the pot and toss in the juices.
09 - Preheat oven to 350°F. Slice slider buns and brush tops lightly with melted butter. Place on a baking tray and warm in the oven for 5 minutes.
10 - Pile pulled beef onto each bun, top with 1–2 pickle slices, and cover with the bun tops. Serve immediately.