01 - Line a 9x13 inch baking sheet with parchment paper to prevent sticking.
02 - Melt the dark chocolate in a heatproof bowl set over a pot of simmering water, stirring constantly until smooth and glossy. Alternatively, microwave in short intervals, stirring between each.
03 - Stir the peppermint extract into the melted dark chocolate until fully incorporated.
04 - Pour the dark chocolate mixture onto the prepared baking sheet and spread evenly with a spatula to approximately 1/4 inch thickness.
05 - Melt the white chocolate using the same double boiler method, being careful not to overheat as white chocolate scorches easily.
06 - Drop spoonfuls of melted white chocolate randomly over the dark chocolate base. Use a skewer or toothpick to gently swirl the white chocolate through the dark chocolate, creating a marbled pattern.
07 - Sprinkle crushed peppermint candies evenly over the surface while chocolate is still melted.
08 - Refrigerate for approximately 45 minutes, or until completely firm and set throughout.
09 - Break the bark into irregular pieces and store in an airtight container at cool room temperature or refrigerated for longer storage.