Melt the Dark Chocolate: In a microwave-safe bowl, combine the dark chocolate chips (and coconut oil, if using). Microwave in 30-second intervals, stirring after each, until melted and smooth.
Prepare a Baking Sheet: Line a baking sheet with parchment paper, ensuring it covers the entire bottom without wrinkles.
Spread the Dark Chocolate: Pour the melted dark chocolate onto the prepared baking sheet. Use a spatula to spread it evenly to about 1/4 inch thickness.
Chill: Place the baking sheet in the refrigerator for about 20 minutes, or until the dark chocolate is fully set.
Melt the White Chocolate: In another microwave-safe bowl, melt the white chocolate chips in the same way you melted the dark chocolate, stirring until smooth.
Add Cranberries and Mint: Once the white chocolate is melted, stir in the chopped dried cranberries and half of the crushed peppermint candies.
Layer the White Chocolate: Pour the white chocolate mixture over the set dark chocolate layer, spreading it gently to cover evenly.
Add Final Touches: Sprinkle the remaining crushed peppermint candies and a pinch of sea salt over the top of the white chocolate layer.
Chill Again: Return the baking sheet to the refrigerator for another 30 minutes, until fully set.
Break and Serve: Once set, take the bark out of the refrigerator, and using your hands, break it into irregular pieces.
Notes
Arrange the bark pieces on a festive platter and garnish with a few whole cranberries and peppermint candies for an added holiday touch.