01 - Line a 9x13-inch baking sheet with parchment paper, ensuring complete coverage to prevent sticking.
02 - Place chopped dark chocolate in a heatproof bowl over gently simmering water, stirring constantly until smooth and glossy. Alternatively, microwave in 20-second intervals, stirring between each burst.
03 - Remove melted dark chocolate from heat and immediately stir in peppermint extract until fully incorporated.
04 - Pour the minted dark chocolate onto the prepared baking sheet. Use an offset spatula to spread into an even rectangle approximately 1/4 inch thick.
05 - Melt the chopped white chocolate using the same double boiler method or microwave technique, stirring until completely smooth.
06 - Drop spoonfuls of melted white chocolate over the dark chocolate base. Drag a skewer or toothpick through both chocolates in swirling motions to create a marbled pattern.
07 - Immediately sprinkle crushed peppermint candies and mini chocolate chips over the surface while chocolate is still warm. Press gently to ensure adherence.
08 - Refrigerate the tray for at least 1 hour or until completely firm and set throughout.
09 - Remove from refrigerator and break the bark into irregular pieces. Store in an airtight container at cool room temperature for up to 2 weeks.