Heat oven to 375F. Cut 3 unsliced loaves of sandwich bread into 2" slices. With cookie cutter or cardboard pattern, cut slices into rounds. Cut out center of each round, leaving 1/2" thick wall on bottom and sides. Brush tops and sides of rounds with melted butter or margarine. Bake on ungreased baking sheet 12 to 15 minutes or until golden brown.