Preheat oven to 350 degrees F.
Add the chicken and BBQ sauce to a bowl and stir to combine.
Cut off the top of the Hawaiian rolls and set aside. Spread the chicken mixture over the bottom of the Hawaiian rolls.
Top the chicken with the red onions, followed by the cheese slices then the Hawaiian roll tops.
Melt the butter in a small bowl then brush it on the top of the rolls.
Mix together the garlic powder, onion powder, parsley and oregano then sprinkle it on top of the rolls.
Bake for 10 minutes or until the cheese is melted and the rolls are golden brown.