01 - Line a baking sheet with parchment paper.
02 - Gently melt dark chocolate in a heatproof bowl set over simmering water, stirring until smooth; alternatively, microwave in 30-second intervals, stirring between each until fully melted.
03 - Remove melted chocolate from heat and stir in peppermint extract.
04 - Pour chocolate onto prepared sheet and spread evenly to a thickness of 1/4 inch.
05 - Evenly sprinkle crushed peppermint candies over the chocolate surface.
06 - Press the peppermint pieces gently into the chocolate using a spatula.
07 - Allow the bark to cool undisturbed at room temperature for 30 minutes.
08 - Transfer to refrigerator and chill for 20 to 30 minutes until firm.
09 - Once set, break into pieces and store in an airtight container.