Line a baking sheet (approx. 9×13”) with parchment paper or a silicone mat.
Melt the dark chocolate: place chocolate chips or chopped chocolate in a microwave-safe bowl and microwave in 30-second intervals, stirring after each until fully melted and smooth. Alternatively, use a double boiler on the stove.
Pour melted dark chocolate onto the prepared sheet. Spread evenly using an offset spatula (or the back of a spoon).
Chill in fridge or freezer until the dark layer is just set (about 5–10 minutes, or until firm at the edges but slightly soft in the middle). This helps white chocolate adhere properly.
Melt the white chocolate in the same way (microwave or double boiler). Optionally stir in peppermint extract for extra minty flavor.
Pour the white chocolate over the chilled dark layer, spreading gently to cover completely.
Immediately sprinkle the crushed candy cane pieces evenly on top of the white chocolate layer — press gently so pieces stick.
Chill until bark is fully set (about 20–30 minutes).
Once set, remove from fridge and let rest at room temperature 5–10 minutes before breaking into shards or squares.
Store in an airtight container at cool room temp or fridge.