These cookies are tender, tasty and not complicated to make.
Beat butter until smooth and fluffy. Sift together icing sugar and cocoa powder over butter and beat in. Stir in vanilla, egg yolk and milk. Add flour, salt and baking powder to cocoa mixture and blend until incorporated. Shape dough into disc, wrap and chill for 20 minutes.
Preheat oven to 325° F. On a surface lightly dusted with icing sugar, roll out dough to 1/8-inch thick. Cut into desired shapes and transfer carefully to a parchment-lined baking sheet. Bake for 12 to 15 minutes, until cookies can be lifted easily away from the parchment. Allow to cool on baking sheet. Cookies can be dusted with icing sugar to finish.
Cookies will keep in an airtight container for 2 to 3 weeks.
Yield: 2 to 3 dozen cookies