Preheat oven to 325 degrees Fahrenheit. Line baking sheet with parchment paper or silicon baking sheet.

In a small bowl, mix flour, baking soda, and salt. Set aside.

In stand mixer with paddle attachment, cream together brown sugar, granulated sugar, and melted butter until light and fluffy. Add egg, egg yolk, and vanilla bean paste. Cream until thoroughly combined.

Slowly add dry ingredients; mix until just combined.

Using a medium ice cream scoop, place 2 inches apart on baking sheet.

Top each cookie with a pinch of fleur de sel

Bake for exactly 15 minutes

Cool cookie on baking sheet before moving to baking rack. Enjoy with a glass of cold milk.