Step 1: Creaming the Foundation

Start by beating your softened butter and granulated sugar together in a large bowl. You want to go until the mixture looks pale, fluffy, and increases in volume. This usually takes about 3 to 5 minutes with a hand mixer.

Step 2: Incorporating the Flavor

Add your single egg yolk and the vanilla extract to the creamed butter. Continue to beat the mixture until the yolk is fully integrated and the batter looks smooth and glossy.

Step 3: Folding in the Dry Ingredients

Whisk your flour and salt together in a separate bowl, then gradually add it to the wet mixture. Use a low speed or a spatula to mix until just combined. Mixing too much now will make the cookies tough instead of crumbly.

Step 4: Chilling and Shaping

If you want to pipe these into stars or circles, do it now while the dough is soft. If you want to cut out shapes, wrap the dough in plastic and chill for at least 1 hour. This prevents the cookies from spreading too much in the oven.

Step 5: The Golden Bake

Preheat your oven to 350°F (175°C). Bake the cookies for 8 to 10 minutes. Watch them closely—you want the bottoms to be lightly golden, but the tops should remain pale and delicate.

Step 6: Cooling for Crispness

Let the cookies rest on the baking sheet for 5 minutes to set before moving them to a wire rack. This ensures they develop that signature snap.