Step 1

Knead the dough by beating the soft butter with the yolks, vanilla and regular sugar. Gradually introduce the flour, each time kneading with a spoon. divide the dough into 2 parts and add cocoa to the order. Knead thoroughly, wrap the dough in food wrap and place in the refrigerator for 30 minutes.

Step 2

Roll out the prepared dough and use a glass to cut out circles. With a small plastic lid, press the circles slightly, imitating the shape of buttons. Use a plastic tube to make holes in the buttons.

Step 3

Place on a baking tray lined with parchment paper and bake in the microwave on the appropriate setting.

Step 4

Cool slightly and thread onto a thick string. Sprinkle with powdered sugar before serving.