01 - Combine ground beef, kosher salt, black pepper, smoked paprika, garlic powder, and onion powder in a large bowl. Mix gently until just incorporated, taking care not to overwork the meat.
02 - Divide the seasoned beef mixture into 12 equal portions. Shape each portion into a small patty, making them slightly wider than the brioche buns to account for shrinkage during cooking.
03 - Set up grill or large skillet over medium-high heat, allowing it to come to temperature.
04 - Grill or pan-fry patties for 2-3 minutes on each side until well-browned and cooked through, reaching an internal temperature of 160°F.
05 - During the final minute of cooking, brush each patty with barbecue sauce and top with half a slice of cheddar cheese. Cover briefly to melt the cheese.
06 - Toss coleslaw mix with mayonnaise and apple cider vinegar in a small bowl. Season with salt and pepper to your preference.
07 - Slice brioche buns in half and brush the cut sides with melted butter. Toast until golden brown and lightly crisped.
08 - Place a cooked beef patty on each bottom bun. Layer with coleslaw, red onion slices, pickles, and fresh chives. Top with the remaining bun and serve while warm.