Melt dark chocolate. Once melted, pour into a cookie sheet lined with parchment paper. Stick in the fridge for a few minutes to harden.
Take candy canes out of their wrappers. Put them in a large plastic bag. Wrap the bag in a kitchen towel. Take rolling pin and smash the daylights out of the candy canes. I guess you could use a food processor to chop them up if you were feeling civilized, but that's not really my style.
Melt the white chocolate. Stir in peppermint extract or oil. Spread over top of the now hardened dark chocolate. Sprinkle with candy cane shards. Stick back in the fridge for 30 minutes or so to harden. Remove from fridge and break into pieces. Eat.