In the bowl of a mixer, combine butter, sugar and salt and mix until blended, about 2 minutes.

One by one, add the egg yolks, mixing until incorporated.

Add the vanilla extract.

Turn the mixer to low and slowly add the flour. Mix until incorporated.

Form dough into 4 long, even logs.

Wrap and chill.

Unwrap and slice into even slices, about 1/2" thickness.

This is your opportunity to dip the edges in sugar, sprinkle with lavender, whatever your heart desires.

Bake at 325° on non-stick cookie sheets for 15-20 minutes until just barely golden.

Cool on a wire rack and enjoy!