Preheat oven to 450°F. Brush a 15½ x 10½-inch jelly-roll pan with oil, and arrange potatoes in a single layer in pan. Bake 10 minutes. Flatten potatoes, using he back of a wooden spoon until rounds touch and cover entire pan. Bake 20 more minutes or until crisp. Top with remaining ingredients. Bake 5 to 10 minutes or until cheese melts.