In a small mixing bowl, combine peanut butter with a little water or half a mashed banana. (The water and banana aren’t essential but help with freezing consistency.)
Spoon the mixture into the cubes, or drop onto the tray just like you would cookie dough.
Freeze. If you need to reuse the tray right away, pop out the cubes and store them in a bag or container in the freezer.
Serve. Turn any hot dog into a happy camper.