Line a large baking sheet with parchment paper or a silicone baking mat.

Melt the white candy melts in a microwave-safe bowl in 30-second intervals, stirring between each, until completely smooth.

Spread the melted white chocolate onto the prepared baking sheet in an even layer approximately 1/4 inch thick.

Evenly distribute the crushed Oreo pieces over the surface of the wet chocolate.

Melt the orange and purple candy melts in separate small bowls according to package directions.

Drizzle the orange and purple melted candy over the cookie layer using a spoon or piping bag.

Scatter the Halloween sprinkles and edible candy eyes across the bark, pressing down lightly to ensure they adhere.

Place the baking sheet in the refrigerator for 30 minutes or until the chocolate is completely firm.

Break the chilled bark into irregular pieces by hand or with a sharp knife before serving.