Cut cucumber into slices - as many as you like, but make it an even number so each cucumber bite has a top and bottom piece.
Gently wipe half of the slices dry with a paper towel. This will make it easier to spread the peanut butter on to them.
Spread the dried slices with a bit of peanut butter, then add a bit of jam on top.
Top each one with the remaining cucumber slices, and gently press down so they stick together.