Trim the crusts off the bread.
Flatten the bread using a rolling pin or a glass
Lie 1/2 Slice of American Cheese on the flattened bread and carefully roll it a couple times. You may simply fold it twice if that's easier.
In a skillet, melt a couple tablespoons of butter/margarine
Place the rolls in the skillet, seam side down and press on them for a moment until it fries and effectively seals shut.
Turn every once in awhile until the whole roll is golden brown
Serve alone or to accompany soup