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 constantly until completely smooth and glossy. Alternatively, microwave in 20-second intervals, stirring between each burst.
03 - Remove melted dark chocolate from heat source and thoroughly incorporate peppermint extract, ensuring even distribution throughout the mixture.
04 - Pour the mint-infused dark chocolate onto the prepared baking sheet. Using an offset spatula, spread into a uniform rectangle approximately 1/4 inch thick, creating an even base.
05 - Melt white chocolate using the same double boiler method, stirring until completely smooth and free of lumps.
06 - Drop spoonfuls of melted white chocolate across the dark chocolate surface. Using a skewer or toothpick, gently swirl through both chocolates in circular or figure-eight motions to create a marbled pattern.
07 - Immediately sprinkle crushed peppermint candies and mini chocolate chips over the swirled chocolate. Press lightly with clean fingers to ensure toppings adhere to the surface.
08 - Transfer the baking sheet to the refrigerator and chill for at least 1 hour until completely firm and set throughout.
09 - Break the chilled bark into irregular pieces. Store in an airtight container at cool room temperature for up to 2 weeks, or refrigerate for extended freshness.