PREHEAT oven to 350°F. Place half the onions in an even layer on bottom of 13x9-inch baking dish.
PARTIALLY slice each hot dog lengthwise in half, being careful to not cut all the way through. Place hot dog, cut sides down, in single layer over onions; top with remaining onions. Drizzle evenly with barbecue sauce.
BAKE 20 minutes or until onions are tender. Serve hot dogs in rolls topped with onions and sauce.
