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 a pot of gently simmering water, stirring continuously until completely smooth and glossy. Alternatively, microwave in 20-second intervals, stirring between each burst.
03 - Remove melted dark chocolate from heat source. Whisk in peppermint extract until fully incorporated and aromatic.
04 - Pour the mint-infused dark chocolate onto the prepared baking sheet. Using an offset spatula, spread into an even rectangle approximately 1/4 inch thick, creating a uniform base.
05 - Melt the chopped white chocolate using the same double boiler method or microwave technique, stirring until completely smooth and fluid.
06 - Drop spoonfuls of melted white chocolate evenly across the dark chocolate surface. 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 swirled chocolate while still melted. Press gently with the spatula to ensure adherence.
08 - Transfer the baking sheet to the refrigerator. Chill for at least 1 hour until completely firm and set throughout.
09 - Remove the chilled bark from the refrigerator. Break into irregular pieces by hand or score with a knife for cleaner edges. Store in an airtight container at cool room temperature for up to 2 weeks.