3 ingredient shortbread cookies

3 ingredient shortbread cookies 1 cup soft butter 1/2 cup icing sugar (powdered sugar) 2 cups plain flour Cream butter and icing sugar Add sifted flour Mix until just combined Dust bench with icing sugar Roll dough into a log Wrap in grease proof paper and chill in fridge 30 mins Preheat oven to 300 Slice log into individual cookies Bake 15 mins