Begin by chopping 12 oz of white chocolate into smaller pieces for even melting. Place the chopped chocolate in a microwave-safe bowl and heat on medium power in 30-second increments, stirring in between each interval until smooth, about 1 to 2 minutes.

Carefully pour the melted white chocolate onto a parchment-lined baking sheet. Use a spatula to spread the chocolate evenly across the surface to about a quarter-inch thick.

While the chocolate is still warm, sprinkle chopped Halloween Oreos, Reese’s Pieces, sprinkles, and eyeball candies over the surface, pressing down slightly to adhere.

Transfer the baking sheet to the refrigerator and chill for at least one hour until the chocolate hardens.

After chilling, break the bark into irregular pieces and serve.