This stuff is super simple, very few ingredients. If I have one tip, it would be to use a higher quality chocolate/white chocolate. I would recommend the Ghirardelli chocolates, insanely good and easy to melt.
12 ounces white chocolate, broken into pieces (6 ounces for top and bottom layer)
6 ounces semi-sweet chocolate, broken into pieces
1 and 1/2 teaspoons vegetable, coconut, or canola oil (1/2 teaspoon for each layer)
1/2 teaspoon peppermint extract, (1/4 for the white and 1/4 for the semisweet chocolate
3 regular size candy canes, crushed
Find it online: https://lolohomekitchen.com/2017-12-peppermint-bark-dcc3y/