01 - Line a baking sheet with parchment paper and set aside.
02 - Melt the white chocolate in a heatproof bowl set over a saucepan of gently simmering water, stirring until smooth. Alternatively, microwave in 30-second bursts, stirring between each interval, until fully melted.
03 - Pour the melted white chocolate onto the prepared baking sheet and spread into an even rectangle about ¼ inch thick.
04 - Melt the semi-sweet or milk chocolate using the same method. Drizzle it over the white chocolate in thin lines or random patterns, then use a toothpick or skewer to swirl the two chocolates together for a marbled effect.
05 - Immediately sprinkle the robin egg candies, pastel sprinkles, and mini chocolate chips evenly over the surface, gently pressing larger candies so they adhere.
06 - Allow the bark to set at room temperature for 30–40 minutes, or refrigerate for 15–20 minutes until completely firm.
07 - Once fully set, break the bark into large irregular pieces and serve.