01 - Preheat your oven to 300°F for the initial braising process.
02 - Rub the beef chuck roast thoroughly with olive oil, then coat evenly with salt, pepper, smoked paprika, garlic powder, and onion powder on all sides.
03 - Heat a large Dutch oven over medium-high heat. Sear the seasoned beef on all sides until deeply browned, approximately 4-5 minutes per side. Remove the beef and set aside on a plate.
04 - In the same pot, add the sliced onions and minced garlic. Sauté for 2-3 minutes, stirring frequently, until the onions are softened and fragrant.
05 - Pour in the beef broth, barbecue sauce, Worcestershire sauce, brown sugar, and apple cider vinegar. Stir well to combine and bring the mixture to a gentle simmer.
06 - Return the seared beef to the pot, nestling it into the liquid. Cover tightly with the lid and transfer to the preheated oven.
07 - Braise the beef for 4 hours, turning the roast once halfway through cooking, until the meat is fork-tender and easily shreds apart.
08 - Remove the beef from the pot and shred using two forks, pulling along the grain. Skim any excess fat from the braising liquid, then return the shredded beef to the pot and toss thoroughly to coat in the juices.
09 - Increase oven temperature to 350°F. Slice the slider buns in half horizontally and brush the cut sides lightly with melted butter. Place on a baking sheet and warm for 5 minutes until lightly toasted.
10 - Pile the saucy pulled beef generously onto the bottom bun halves. Top each slider with 1-2 pickle slices and crown with the buttered bun tops. Serve immediately while warm.