01 - Line a 9x13 inch baking sheet with parchment paper.
02 - Melt the semisweet or dark chocolate in a heatproof bowl over simmering water or in short microwave intervals, stirring until smooth.
03 - Pour melted dark chocolate onto the prepared baking sheet and spread evenly to a 1/4 inch thickness.
04 - Refrigerate for 15 to 20 minutes until the layer is set but not hardened.
05 - Melt the white chocolate in a clean heatproof bowl using the same method; if desired, stir in peppermint extract.
06 - Pour white chocolate over the set dark layer and spread gently to cover evenly.
07 - Immediately sprinkle crushed peppermint candies evenly over the white chocolate and gently press to adhere.
08 - Refrigerate for about 30 minutes until fully set.
09 - Remove from refrigerator and break into pieces by hand or with a sharp knife. Store airtight at cool room temperature or refrigerated.