Using an ice cream scoop or level tablespoon, drop rounded balls of dough, 3cm/1.25-inch in diameter, onto prepared baking sheets, spacing them 5cm/2-inch apart. Bake for 12-14 minutes, until cookies just begin to brown at the edges. Leave to cool for 10 minutes. While they're still warm, gently roll them in powdered sugar, careful not to cause them to crumble. Transfer to a wire rack to cool completely. Once cooled, roll them in powdered sugar once more.
* For evenly chopped nuts, it’s best to pulse them in a food processor until finely ground, but not to the point that they become a paste. Alternatively, if you want a bit more crunch, you can coarsely chop them.
* To toast the nuts, place them in an even layer on a pan lined with parchment paper and bake in a preheated 350F/180C oven for 8 minutes.