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With separate rubber spatulas, stir both pots of chocolate until melted and glossy.
Add the peppermint oil to the white chocolate and stir. Remove from heat.
Pour the melted dark chocolate onto a parchment paper-lined rimmed cookie sheet. Working quickly, use a wood graining tool from hardware store, to create wood grain look on the bottom layer of bark.
Pour the melted white chocolate on top. Spread evenly with an offset spatula.