Place candy canes in a ziplock freezer bag and seal shut. Crush candy canes until you have various size pieces to sprinkle on your bark. Or you can just buy it already crushed at a bulk store.
Line a cookie sheet with parchment paper or a silicone mat. Set aside.
Place semi sweet chocolate chips in a saucepan and melt over LOW heat. Or if you prefer microwave, heat 30 seconds, stir, then continue heating in 15-second intervals (stir between each interval) until melted and smooth.
Once melted, pour over the parchment paper and quickly spread it with a butter knife. Refrigerate for ten minutes or so until the chocolate is firm.
Once the chocolate layer is firm, remove from refrigerator and set aside.
Place white chocolate, peppermint extract, and oil into a glass bowl and microwave for 30 seconds, stir, then keep heating at 15 second intervals (stirring between each) until melted and smooth.
Quickly pour white chocolate over dark, then spread it with a spatula. Immediately sprinkle crushed candy over the bark. Press it into the white chocolate gently. Refrigerate 20 minutes. Remove from refrigerator and leave it in a cool place to harden completely. After 24 hours, break it into pieces and store.
Enjoy!