Preheat oven to 300 degrees Fahrenheit

Line a cookie sheet with parchment paper 

Place butter in a pan over medium-low heat. Melt butter and whirl the pan occasionally

When butter turns brown and develops a nutty aroma, remove from heat and strain into a bowl. Cool for a few minutes

Add confectioners sugar and mix using a spatula or wooden spoon

Add salt, vanilla, and egg white. Mix until combined

Finally, add the flour little by little, mixing well 

Roll dough into balls and place them on a cookie sheet. Flatten the balls with your hands 

Bake for 15-20 minutes or until tops are firm and the color is golden

Remove from the oven and place the cookies on a cooling rack. Dust with confectioners sugar

Enjoy!