Preheat your oven to 350°F. Line baking sheets with silicone mats or parchment paper.
In a mixing bowl, whisk together the flour, baking soda, baking powder, and salt. Set aside.
In a stand mixer, cream the room temperature butter and granulated sugar until creamy, about 2-3 minutes.
Add the egg, egg yolk, and vanilla extract; mix until smooth.
Gradually add the dry ingredients to the wet mixture, mixing on low until a dough forms. Don't over-mix.
Using a cookie scoop, portion out the dough and roll into balls.
Roll each ball in sugar to coat and place on prepared baking sheets with spacing between them.
Bake for 11-12 minutes, until edges are set but centers remain slightly underbaked.
Cool on the baking sheet for 2 minutes before transferring to a wire rack to cool completely.