Place semi-sweet chocolate chips in a microwave-safe bowl and microwave in 30-second intervals, stirring until smooth.

Spread melted chocolate over 9"x13" baking sheet lined with parchment paper. Refrigerate 15 minutes.

Place white chocolate chips in a microwave-safe bowl and microwave in 30-second intervals, stirring until smooth. Stir in peppermint extract.

Spread white chocolate over semi-sweet chocolate. Top with crushed candies. Refrigerate 20 minutes.

Break into pieces and serve. Store leftovers in an airtight container.