Preheat your oven to 350°F (175°C) and line baking sheets with silicone mats or parchment paper.

In a medium bowl, whisk together the all-purpose flour, baking soda, baking powder, and salt until thoroughly combined.

In a stand mixer, beat the unsalted butter and granulated sugar together until creamy, then mix in the egg, egg yolk, and vanilla extract.

Gradually add the dry mixture to the butter-sugar mixture on low speed until just combined.

Using a large cookie scoop, portion out the dough onto prepared baking sheets, roll into balls, and coat in granulated sugar.

Bake for 11-12 minutes until the edges are set and centers look slightly underbaked.

Let the cookies cool on the baking sheet for 2 minutes, then transfer to a wire rack to cool completely.