01 - Line a 9x13 inch baking sheet with parchment paper, ensuring complete coverage to prevent sticking.
02 - Place white chocolate in a microwave-safe bowl. Microwave in 30-second intervals, stirring thoroughly between each burst, until completely smooth and melted. Alternatively, melt in a heatproof bowl set over simmering water, stirring constantly.
03 - Let the melted chocolate cool for 2 minutes to prevent marshmallows from melting completely. Gently fold in the mini marshmallows until evenly distributed throughout the chocolate.
04 - Pour the chocolate-marshmallow mixture onto the prepared baking sheet. Use a spatula to spread into an even layer approximately 1/2 inch thick, working quickly before the chocolate begins to set.
05 - Sprinkle the chopped candy eggs and pastel sprinkles evenly over the surface. Press lightly with the spatula to ensure toppings adhere to the chocolate.
06 - Refrigerate the bark for at least 1 hour until completely firm and set throughout.
07 - Break or cut the bark into irregular pieces. Serve immediately or store in an airtight container.