Preheat oven to 450. Lightly grease a medium casserole dish.

Place chicken in baking dish. Arrange potato slices, peppers, onion and pineapple around chicken. Pour the reserved pineapple juice over all of it and top it all off with the barbeque sauce.

Bake for 1 hour in your preheated oven, or until chicken juice runs clear and potatoes are cooked through.