Cut the 2 vanilla wafers in half lengthwise so you have 4 "finger" pieces.
In a microwave-safe bowl, heat the dark chocolate in 20-30 second increments until completely melted.
Stir the chocolate mixture.
Use an offset spatula to coat the surface of the vanilla wafer "fingers" (this will now be the "bottom") with the melted chocolate and repeat with the remainder.
Place into the freezer or fridge for the chocolate to set.
Once set, flip the vanilla wafer "fingers" so the chocolate side is on the bottom.
Use an offset spatula to coat the surface and sides of the vanilla wafer with the remaining chocolate. (You may need to rewarm the chocolate to ensure a smooth coating).
Pop the tray back into the freeze or fridge for the chocolate to set, about 5-10 minutes.
To join the two Kit Kats together, add a bit of chocolate to the bottom of the KitKat fingers and "glue" together.
Once the Kit Kats have set, break off a piece and enjoy!