With cool hands, quickly knead the dough ingredients into a shortcrust pastry and place in the refrigerator for an hour.
Then roll out 3 - 4 mm thick and cut out as desired. Place the biscuits on a baking tray lined with baking paper, brush with the beaten egg and sprinkle as desired.
Bake at 180 degrees for 10-15 minutes until light brown.
The cookies can also be glazed after baking and only then sprinkled.
A practical recipe that also gives you protein for macaroon biscuits or meringues.