Pre heat oven to 350 degrees.
Place butter, sugar and egg yokes in medium bowl and cream together until light and fluffy. I put these ingredients in my stand mixer and let it beat on medium speed for 3-5 minutes.Add in extract, baking soda and salt and mix until incorporated. Slowly add flour and blend until flour is completely incorporated into batter.
Roll dough into balls about the size of a large walnut then roll into sugar and place on baking sheet. Gently flatten cookies with bottom of a glass dipped in sugar.
Bake for 8-10 minutes. Cookies will be pale and you do not want to over bake them. Remove from cookie sheets and allow to cool on wire rack.
Store in airtight container.