01 - Line a baking sheet with parchment paper or a silicone mat.
02 - Melt the dark chocolate in a heatproof bowl over barely simmering water, stirring frequently until smooth, or microwave in 30-second intervals, stirring in between, until completely melted.
03 - Stir the peppermint extract into the melted chocolate until fully incorporated.
04 - Pour the melted chocolate onto the prepared sheet and spread evenly into a 9x12-inch, 1/4-inch thick layer.
05 - Sprinkle the crushed peppermint candies evenly over the chocolate surface.
06 - Press the candies gently into the chocolate using the back of a spoon or your hands.
07 - Refrigerate the bark for 45 minutes to 1 hour until fully set.
08 - Once firm, break the bark into irregular pieces and store in an airtight container at room temperature or refrigerated as preferred.