Stir in the icing sugar into the cooled butter, then add the flour and the cardamom and mix until smooth dough forms,if the dough is sticky you might add spoonful of flour.
Divide the dough in to two equal pieces, and wrap each piece in plastic wrap or parchment paper and shape them into smooth logs and let it chill in the fridge for 20 minutes.
Preheat the oven to 350f (180c)
Grease a baking sheet and line with parchment paper.
Slice the chilled logs of the dough into 1/2 inch thick disks and arrange them on the prepared baking sheet.
Bake for 12 - 15 minutes or until the edges are just lightly golden.