01 - Rub the beef chuck roast thoroughly with olive oil, salt, black pepper, smoked paprika, garlic powder, and onion powder, ensuring even coverage on all sides.
02 - 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.
03 - In the same Dutch oven, add the sliced onion and minced garlic. Sauté for 2-3 minutes until the onions are softened and fragrant, scraping up any browned bits from the bottom.
04 - 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.
05 - Return the seared beef to the pot, nestling it into the liquid. Cover tightly with the lid and transfer to the preheated oven. Braise for 4 hours, turning the beef once halfway through cooking, until fork-tender and easily shredded.
06 - Remove the beef from the pot and transfer to a cutting board. Using two forks, shred the meat into bite-sized pieces. Skim any excess fat from the braising liquid, then return the shredded beef to the pot and toss thoroughly to coat in the juices.
07 - Slice the slider buns in half horizontally and brush the cut sides lightly with melted butter. Arrange on a baking tray and warm in the oven for 5 minutes until lightly toasted.
08 - Pile a generous portion of pulled beef onto the bottom half of each bun. Top with 1-2 dill pickle slices and cover with the bun tops. Serve immediately while warm.