01 - Line a 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). Stir continuously until completely smooth and melted. 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.
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 skewer to swirl the two chocolates together, creating a marbled effect.
05 - Immediately sprinkle the candy robin eggs, pastel sprinkles, and mini chocolate chips (if using) evenly over the surface. Gently press the larger candies down so they adhere to the chocolate.
06 - Allow the bark to set at room temperature for 30 to 40 minutes. To speed up the process, place it in the refrigerator for 15 to 20 minutes until completely firm.
07 - Once fully set, break the bark into large irregular pieces and arrange on a serving platter.