01 - Line a rimmed baking sheet with parchment paper and set aside.
02 - Place the white chocolate in a heatproof bowl set over a saucepan of gently simmering water (double boiler method), stirring frequently until completely 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 approximately ¼ inch thick using an offset spatula.
04 - Melt the semi-sweet or milk chocolate using the same double boiler or microwave method. Drizzle it over the white chocolate layer in thin lines or random patterns. Use a toothpick or wooden skewer to gently swirl the two chocolates together, creating a marbled effect.
05 - Immediately scatter the candy robin eggs, pastel sprinkles, and mini chocolate chips evenly across the surface. Gently press the larger candies into the chocolate so they adhere firmly once set.
06 - Allow the bark to set at room temperature for 30 to 40 minutes. To speed up the process, place the baking sheet in the refrigerator for 15 to 20 minutes until the bark is completely firm to the touch.
07 - Once fully set, use your hands to break the bark into large, irregular pieces. Arrange on a serving platter or store immediately.