2 tablespoons creamy peanut butter
2 slices white sandwich bread
1 small ripe banana, mashed with a fork
2 tablespoons butter

Spread peanut butter on one slice of bread, then spread mashed banana on other slice, leaving a ¼-inch border around edge. Close sandwich, gently pressing bread slices together.

Heat butter in a heavy skillet over moderate heat until form subsides, then fry sandwich, turning over once, until golden brown, about 2 minutes.