01 - Preheat the oven to 300°F. Combine all dry rub ingredients in a small bowl. Pat the brisket dry and coat evenly with the spice mixture.
02 - Heat olive oil in a large Dutch oven over medium-high heat. Sear the brisket for 3-4 minutes per side until deeply browned.
03 - Remove the brisket temporarily. Pour in beef broth, apple cider vinegar, and Worcestershire sauce, scraping up browned bits from the bottom. Return the brisket fat-side up.
04 - Cover tightly and roast for 4-4.5 hours until the meat offers no resistance when pierced with a fork.
05 - Transfer the brisket to a cutting board and rest for 10 minutes. Shred using two forks. Discard excess fat from the cooking liquid.
06 - Toss the shredded brisket with 1/2 cup BBQ sauce and 2-3 tablespoons of the reserved cooking liquid for moisture.
07 - Set the oven to broil. Arrange slider buns cut-side up on a baking sheet, brush with melted butter, and broil for 1-2 minutes until golden.
08 - Layer sauced brisket, additional BBQ sauce, cheddar cheese, red onion, and coleslaw on each bun. Crown with the tops and serve immediately.