To bake, roll the dough into small balls
and roll into a bowl of thr icing sugar, coating liberally. Put the cookies onto the trays, leaving space in between. Bake for 12-13 minutes until puffed and cracked but starting to set around the edges (this is a fudgy, brownie-like cookie so it’s better to err on the side of caution and underbake these). Allow the cookies to cool on the baking trays for 5 minutes before transferring to a wire rack to cool completely. These will happily keep for a week in a sealed container.