01 - Line an 8x8 inch baking sheet with parchment paper.
02 - Melt the chopped dark chocolate in a heatproof bowl set over a saucepan of barely simmering water, stirring until smooth. Alternatively, melt in a microwave using 30-second intervals, stirring between each until fully melted.
03 - Remove the melted chocolate from heat and stir in the peppermint extract until fully incorporated.
04 - Pour the chocolate mixture onto the prepared baking sheet and spread evenly to about 1/4 inch thickness.
05 - Sprinkle the crushed peppermint candies uniformly over the surface of the chocolate.
06 - Refrigerate for at least 40 minutes, or until the chocolate is completely set.
07 - Break or cut the peppermint chocolate into 12 pieces. Store in an airtight container at cool room temperature or refrigerate for up to two weeks.