Step 1: Melt the chocolate chips in a small heatproof bowl in the microwave, stirring every 30 seconds until smooth. Dip the rims of 4 shot glasses into the melted chocolate, then sprinkle with crushed candy cane. Freeze for 1 minute to set the chocolate.
Step 2: In a large measuring glass or pourable container, mix the liqueur, vodka, and peppermint schnapps together. Divide the mixture among the prepared shot glasses and serve.