Preheat oven to 350 degrees Fahrenheit
Slice rolls in half and place bottoms into buttered 9x13 inch baking dish
Add bbq sauce to chicken and stir together. Spread the chicken over the roll bottoms.
Top the chicken with the red onion and cheese.
Replace roll tops and brush with butter and onion powder mixture.
Cover with tin foil and bake for 15 minutes.
Uncover and bake an additional 5 minutes or until golden brown and heated through.
Refrigerate any leftovers in an air-tight container for up to 3 days.