01 - Line a baking sheet with parchment paper or a silicone baking mat to prevent sticking.
02 - Place chopped dark chocolate in a heatproof bowl. Melt over a pot of simmering water using a double boiler method, or microwave in 30-second bursts, stirring frequently until completely smooth.
03 - Stir half of the peppermint extract into the melted dark chocolate until evenly distributed.
04 - Pour the mint-infused dark chocolate onto the prepared baking sheet. Spread into an even rectangle approximately 8x10 inches using a spatula.
05 - In a clean heatproof bowl, melt the white chocolate using the same double boiler or microwave method. Stir until smooth and glossy.
06 - Stir the remaining peppermint extract into the melted white chocolate until fully incorporated.
07 - Gently pour the white chocolate over the dark chocolate layer. Use a skewer or toothpick to swirl through both layers, creating a marbled pattern.
08 - Immediately scatter green candy-coated chocolates, sprinkles, and pistachios over the surface. Press lightly into the chocolate to ensure adherence.
09 - Refrigerate for 45 minutes until completely firm and set throughout.
10 - Once fully set, break the bark into irregular pieces of desired size and serve immediately or store for later enjoyment.