1-First, preheat your oven to 350°F (175°C) and line your baking sheets with parchment paper to prevent sticking and ensure even baking.

2-In a stand mixer with a paddle attachment, cream the butter, salt, and sugar together until light and fluffy for that ideal texture.

3-Add the egg yolks while mixing and scrape down the sides of the bowl to incorporate everything evenly.

4-Pour in the vanilla extract and mix until fully combined, enhancing the flavor profile of your buttery treats.

5-Gradually add the flour and mix until just incorporated, avoiding over-mixing to keep the cookies tender.

6-Roll the dough into a log, wrap it in parchment paper or plastic wrap, and chill in the refrigerator for at least an hour. For best results, place the dough inside an empty cardboard paper towel roll to maintain its shape.

7-After chilling, sprinkle sanding sugar on a clean surface if using, unwrap the dough, roll it in the sugar, and cut it into even slices with a sharp knife. Then, place the slices on a parchment-lined baking sheet and bake at 350°F for 10-12 minutes or until the edges are just turning golden brown.