Preheat oven to 375 degrees F. Spray a 9x13-inch baking dish with nonstick cooking spray; set aside.

Slice rolls horizontally (keeping them connected) and place the bottom half in the prepared pan.

In a mixing bowl, combine cooked chicken and bbq sauce then spread on top of bottom half of rolls in the pan. Top with red onion, mozzarella cheese and the top half of the rolls.

Brush melted butter over the top of the sliders, sprinkle chopped cilantro on top and cover the pan with foil. Bake covered for 10 minutes then remove foil and cook for an additional 10 minutes, or until cheese is melted.