01 - Preheat the oven to 300°F.
02 - Mix all dry rub ingredients in a small bowl. Pat the brisket dry and rub the mixture all over the meat.
03 - Heat olive oil in a large oven-safe pot or Dutch oven over medium-high heat. Sear the brisket for 3–4 minutes on each side until browned.
04 - Remove the brisket. Pour in the beef broth, apple cider vinegar, and Worcestershire sauce, scraping up any browned bits. Return the brisket to the pot, fat side up.
05 - Cover tightly and roast in the oven for 4–4.5 hours, or until the meat is fork-tender.
06 - Transfer the cooked brisket to a cutting board. Let rest 10 minutes, then shred with two forks. Skim and discard excess fat from the braising liquid.
07 - Toss the shredded meat with 1/2 cup of BBQ sauce and a few spoonfuls of cooking liquid to moisten.
08 - Set oven to broil. Place slider buns cut side up on a baking sheet; brush with melted butter, then toast under the broiler for 1–2 minutes until golden.
09 - Layer brisket, a drizzle of extra BBQ sauce, cheddar cheese, red onion, and coleslaw onto each bun. Top with bun lids and serve immediately.