Process the flour, butter, sugar, egg white, and the seeds from ½ a vanilla bean in a food processor until a dough begins to form.
Form the dough into a 1.5 inch thick log. Wrap in parchment and chill for 20 minutes.
Preheat oven to 350. Line a baking sheet with parchment paper.
Slice the dough into ¼ inch thick circles. Place on the prepared baking sheet.
Bake for 14-16 minutes or until golden brown. Let cool completely.
Stir together the ingredients for the glaze.
Drizzle over the cooled cookies.
Notes
This recipe only calls for the seeds from a vanilla bean. Save the pod from the vanilla bean for other uses. One idea is to add it to a mason jar of sugar to make vanilla sugar.