Preheat oven to 180°c/gas 4.

Mix butter in a large bowl with a wooden spoon,then add egg yolk and vanilla extract.briefly beat to combine.sift flour and mix until combined.Add baking powder till the batter gets non-sticky

Roll out on a board covered in flour and cut out with a cookie cutter.Put on a non-sticky baking tray

Bake for 40 minutes.Put on a cooling rack to firm it up