Place the chocolate in a microwave safe bowl. Microwave at 30-second intervals until mostly melted, then stir until fully melted. Transfer the chocolate to a piping bag with a small tip, or to a plastic bag with one of the tops cut off.
Working quickly, squeeze some chocolate around the underside of the nilla wafers. Attach the bottom of a Hershey Kiss to the wafers.
Squeeze a small swirl of chocolate on the top of the wafer for the stem. Let set for 30 minutes.