01 - Line a baking sheet with parchment paper to prevent sticking.
02 - Place semisweet chocolate chips in a microwave-safe bowl. Microwave in 30-second intervals, stirring thoroughly after each interval, until completely smooth.
03 - Pour melted semisweet chocolate onto prepared baking sheet. Use an offset spatula to spread evenly into approximately 1/4-inch thickness.
04 - In separate microwave-safe bowls, melt white chocolate chips and colored candy melts. Microwave in 20-second intervals, stirring between each, until smooth and fully melted.
05 - Drop spoonfuls of melted white chocolate and colorful candy melts randomly across the dark chocolate base. Drag a toothpick or skewer through the chocolates in swirling motions to create marbled patterns.
06 - Immediately scatter candy-coated chocolates, candy eyes, and Halloween sprinkles over the warm bark while chocolate is still soft.
07 - Allow bark to cool completely at room temperature for approximately 30 minutes, or refrigerate for 10 to 15 minutes until firm and set.
08 - Once fully set, break bark into irregular jagged pieces by hand. Arrange on serving platter or store in airtight container.