Preheat oven to 325 degrees.
Combine confectioners sugar, cayenne pepper and salt in large mixing bowl.
Bring a pot of water to the boil.
Add walnuts and cook for 3 minutes. Pour walnuts into a colander and drain well.
Immediately add walnuts to spice mixture and toss to combine thoroughly.
Line a baking sheet with parchment or a Silpat and spread out the walnuts on the sheet.
Bake for about 35 minutes until a deep golden brown, turning them once or twice while baking. Allow to cool and break up big chunks. Enjoy!