Add the softened butter, brown sugar and white sugar to a bowl.
Cream together with an electric mixer for 30 seconds.
Add in the egg yolk and vanilla and beat until smooth.
Add in the dry ingredients aside from the chocolate chips, making sure to spoon and level the flours.
Beat until a smooth dough forms.
Fold in the chocolate chips.
Add the dough to the fridge for 30 minutes.
Preheat the oven to 350 degrees Fahrenheit.
Use a medium cookie scoop or 2 tablespoons and scoop into balls.
Place on a baking sheet lined with parchment paper.
Bake for 13-17 minutes or until the edges are golden brown.
They will continue to firm up quite a bite as they cool, so careful not to over bake if you like soft centers!
Let cool on the baking sheet for about 15 minutes, then transfer to a wire rack to finish cooling.
Sprinkle with salt flakes if desired and enjoy!