In a stand mixer fitted with a paddle attachment, cream together the softened butter, salt, and sugar until the mixture is light and fluffy.

Add the egg yolks while continually mixing, ensuring well combined.

Pour in the 2 teaspoons of vanilla extract and mix thoroughly.

Gradually add the flour, mixing until just incorporated to form a cohesive dough.

Roll the dough into a log shape, wrap it tightly in parchment paper or plastic wrap, and chill it in the refrigerator for at least one hour.

Once the dough is chilled, sprinkle sanding sugar on a clean surface.

Unwrap your dough log and roll it in the sugar.

Using a sharp knife, cut the dough into slices of even thickness to create your cookies.

Place the slices on a parchment-lined baking sheet.

Bake in a preheated oven at 350°F for about 10-12 minutes or until the edges are just turning golden brown.