Line a baking sheet with parchment paper, making sure it lies flat. This keeps the chocolate from sticking and helps lift the bark out easily later. I always leave a little overhang on the sides for easy removal.
Place Oreos in a zip-top bag and crush them into chunky pieces. Do the same with candy canes, keeping them slightly coarse. This texture gives the bark a great crunch without turning it dusty.
Add white chocolate chips to a microwave-safe bowl and heat in 30-second intervals. Stir between each round until smooth and creamy. I take my time here to avoid scorching the chocolate.
Stir the peppermint extract into the melted chocolate. Mix gently so the flavor distributes evenly. At this point, the chocolate should smell lightly minty, not overpowering.
Fold most of the crushed Oreos into the chocolate, saving a little for topping. I like doing this by hand so the cookies don’t break down too much. The mixture should look thick and speckled.
Pour the mixture onto the prepared baking sheet and spread it into an even layer. Don’t worry about perfection; rustic edges look great. Aim for about ¼-inch thickness.
Sprinkle remaining Oreos and crushed candy canes on top. If using semi-sweet chocolate, melt it and drizzle over the surface, then gently swirl with a knife.
Place the baking sheet in the refrigerator for about 45 minutes. Once fully set, lift the bark out and break it into pieces. Now it’s ready to enjoy.