1. 1. Cream Butter and Sugar: In a large bowl, cream together the cold, cubed salted butter and granulated sugar until light and fluffy. A stand mixer works best.

2. 2. Add Wet Ingredients: Beat in the egg yolk and vanilla extract until fully combined. Scrape down the sides of the bowl.

3. 3. Incorporate Flour: Gradually add the all-purpose flour, mixing on low speed until just combined. Do not overmix the dough for these Crispy French Salted Butter Cookies.

4. 4. Chill Dough: Form the dough into a disc, wrap tightly in plastic, and refrigerate for at least 30 minutes. This prevents spreading and helps achieve perfectly crispy French butter cookies.

5. 5. Preheat and Prep: Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.

6. 6. Shape Cookies: Roll the chilled dough into 1-inch balls. Place them about 2 inches apart on the prepared baking sheets. Flatten slightly with a fork or the bottom of a glass.

7. 7. Bake: Bake for 10-12 minutes, or until the edges are golden brown. The centers of these Crispy French Salted Butter Cookies should remain slightly pale.

8. 8. Cool: Let the Crispy French Salted Butter Cookies cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely. Enjoy these beautiful salted butter cookies!