Cut the entire pack of Hawaiian rolls in half horizontally using a serrated knife. Keep them attached. Place the bottom half in a 9x13 baking dish lined with parchment paper.
Toss the shredded rotisserie chicken in a large bowl with the BBQ sauce until fully coated.
Spread the BBQ chicken evenly over the bottom layer of the rolls.
Sprinkle the crumbled, crispy bacon aggressively over the chicken layer.
Drizzle or spoon the ranch dressing over the bacon generously.
Place the top half of the rolls on, brush with melted butter, and bake at 350°F for 15 minutes until golden brown and hot throughout.