01 - Line a rimmed baking sheet with parchment paper, ensuring the paper lies flat across the entire surface.
02 - Place the white chocolate in a heatproof bowl set over a saucepan of gently simmering water (double boiler method), stirring continuously until completely smooth and glossy. Alternatively, microwave in 30-second bursts, stirring thoroughly 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, random lines. Drag a toothpick or wooden skewer through both chocolates in sweeping motions to create 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.
06 - Let the bark set at room temperature for 30 to 40 minutes until completely firm. To accelerate setting, place the baking sheet in the refrigerator for 15 to 20 minutes.
07 - Once fully set, use your hands to break the bark into irregular, generous-sized pieces. Arrange on a serving platter or store immediately.