Pour the box of Puffins into a very large bowl.
In a small, microwave-safe bowl, heat the Nutella in a microwave until soft, about 30 seconds.
Pour the warm Nutella over the Puffins and stir until evenly coated.
Pour the powdered sugar over the top of the Puffin and stir until evenly distributed.
Enjoy immediately or store in an airtight container for up to a week.