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 smooth. Alternatively, microwave in 20-second intervals, stirring between each, until fully melted.
03 - Remove melted dark chocolate from heat and thoroughly incorporate peppermint extract, ensuring even distribution.
04 - Pour the minted dark chocolate onto the prepared baking sheet. Using an offset spatula, spread into an even rectangle approximately 1/4 inch thick.
05 - Melt white chocolate using the same double boiler method or microwave technique employed for the dark chocolate until completely smooth.
06 - Drop spoonfuls of melted white chocolate across the dark chocolate surface. Drag a skewer or toothpick through both chocolates in a figure-eight motion to create decorative marbling.
07 - Immediately sprinkle crushed peppermint candies and mini chocolate chips over the surface. Press gently with fingertips to ensure toppings adhere to the soft chocolate.
08 - Refrigerate the baking sheet for 1 hour minimum, or until chocolate is completely firm and set to the touch.
09 - Remove from refrigerator and break bark into irregular pieces. Store in an airtight container at cool room temperature for up to 2 weeks.