Pour the flour on the counter and do well in it. In the well put the cold butter, cut into cubes, egg, vanilla and sugar. Knead a smooth dough, wrap it in foil and place it in the refrigerator for 15 minutes. Roll out the dough on a floured surface to a thickness of 3-4 mm. Cut circles. Arrange the circles on a tray littered with baking paper. Coat them with a mixture of beaten yolk with one tbsp cream. Spread nuts on them and worried slightly to the dough. Bake cookies in a preheated 180C degrees oven until ready. Melt the chocolate in a water bath and cool dip cookies halfway into it.