Nigella's Christmas Chocolate Cookies - Nigella's Christmas Kitchen - BBC Two

Nigella Lawson makes her Christmas cookies, showing that Christmas doesn't have to come 'off the shelf'.

Cookies: 2 1/4 sticks (18 Tbsp.) soft butter 3/4 cup sugar 1/3 cup unsweetened cocoa powder 2 cups all-purpose flour 1/2 tsp. baking soda 1 tsp. baking powder Topping: 2 Tbsp. unsweetened cocoa powder 1 1/2 cups confectioners' sugar 1/4 cup boiling water , from a kettle 1 tsp. vanilla extract Christmas sprinkles