Preheat oven to 350 degrees.Spread butter on one side of each bread slice. Place bread buttered-side-down on ungreased cookie sheet. Using small sharp knife, cut out shapes from 4 bread slices to make jack-o'-lantern faces. On remaining bread slices layer 1 slice Monterey Jack and 1 slice Cheddar. Bake 10 - 12 min. or until cheese is melted. Remove from oven; place jack-o'-lantern bread slice on sandwiches and serve.