Step 1

Preheat oven to 375˚F. Cream butter and sugars together. Beat in egg yolk and vanilla. Sift in flour 1 cup at a time and mix until combined.

Step 2

Roll cookie dough into 1”-1 1/2” balls. Flatten each ball slightly with the bottom of a flat mug or cup.

Step 3

Whip egg white. Dip fork into egg white. Make a cross hatch pattern with the back of the fork. Press a single walnut on top of each cookie.

Step 4

Bake for 10-12 minutes and allow to cool before serving.