Line a baking sheet with parchment paper or a silicone mat. This will make sure your candy bark doesn’t stick when it hardens.
In a microwave-safe bowl, melt the white candy melts in 30-second bursts, stirring after each interval until smooth.
Pour the melted white candy onto your prepared baking sheet and use a spatula to spread it into a thin, even layer.
In separate bowls, melt the orange, purple, green, and black candy melts using the same microwave method. Stir well until smooth.
Drop spoonfuls of the melted colored candy onto the white base. Use a toothpick or skewer to swirl them together, creating a spooky, marbled effect.
Quickly sprinkle candy corns, broken pretzels, and Halloween sprinkles on top. Press them gently so they stick.
Leave the bark at room temperature for 1-2 hours to fully set, or pop it in the fridge for about 30 minutes.
Once hardened, break the bark into chunks and enjoy!