Heat oven to 400F. Slice onion into thin slices. Separate slices into rings. Heat a medium skillet over medium heat. Add onion rings and cook for 3 minutes to soften slightly. Meanwhile heat pork in microwave as package directs for 2 minutes. Lay crust on a pizza pan. Spread with softened onions, BBQ pork and top with cheese. Sprinkle with peppers if desired. Bake at 400F for 12 minutes, or until pork is heated through and cheese is melted. Cut into wedges and serve.