Line a baking sheet with parchment paper.
Crush candy canes and set aside.
Place dark chocolate in a microwave-safe bowl and heat in 20-second bursts, stirring between each, until smooth.
Stir in coconut oil if needed.
Spread the melted dark chocolate evenly on the lined baking sheet.
Chill for about 10 minutes, or until firm.
Melt the white chocolate the same way, using 20-second bursts and stirring until smooth.
Pour the melted white chocolate over the firm dark chocolate layer and spread evenly.
Immediately sprinkle crushed candy canes on top and press lightly so they adhere.
Chill for about 20 minutes, or until fully set.
Break bark into pieces and serve or store.