Start by lining a baking sheet with parchment paper.
In a microwave-safe bowl, add the dark chocolate and microwave in 30-second intervals, stirring until fully melted and smooth.
Pour the melted dark chocolate onto the prepared baking sheet and spread it evenly into a rectangular shape, about ¼ inch thick.
In a separate bowl, melt the green mint baking chips using the same method as before.
Drop dollops of the melted mint chips over the dark chocolate and swirl them gently using a skewer.
Sprinkle the chopped Andes mint candies over the top of the swirl bark.
Place the baking sheet in the refrigerator for about 30-45 minutes, or until the bark is set. Once hardened, lift it out and break it into pieces.