Slice the bananas thinly.
Melt the chocolate using a double boiler or microwave.
Spread the melted chocolate widely on a baking sheet.
Place the banana slices on top of the chocolate.
Spoon small amounts of peanut butter onto the bananas.
Sprinkle crushed peanuts or other nuts over the top.
Refrigerate or freeze until set.
Break into pieces of desired size to serve.