Milk Cookies

In a bowl, combine the softened butter, sugar, vanilla, salt, and egg. Mix until smooth, then add the warm milk and baking soda. Mix again.

Stir in the starch until combined.

Gradually add the sifted flour in 2-3 batches to form a soft dough. Do not overknead the cookie dough; just bring all the ingredients together. Wrap the finished dough in plastic wrap and chill in the refrigerator for 30-40 minutes.

Roll out the chilled dough into a sheet.

Cut out the cookies using a pastry cutter and place them on a baking sheet lined with parchment paper. Brush the unbaked cookies with egg yolk.