Melt the butter in a light-colored saucepan over medium heat. Stir occasionally until the butter foams, then turns golden brown with a nutty aroma. Remove from heat and transfer to a bowl to cool.
In a mixing bowl, combine the cooled browned butter, brown sugar, and granulated sugar. Mix until creamy.
Add the egg, extra yolk, and vanilla extract. Mix until well combined.
Add the all purpose flour, baking soda and salt and fold until a dough forms.
Fold in the semi-sweet chocolate chips until evenly distributed.
Let the dough freeze for about 1-2 hours until firm.
When you are ready to bake the cookies preheat the oven to 350F and line 2 cookie sheets with parchment paper or silicone mat.
Scoop tablespoon-sized portions of dough and roll them into balls. Place them on the prepared baking sheets, leaving space between each for spreading.
Bake in the preheated oven for 11-12 minutes or until the edges turn golden brown.
Once done, remove from the oven and let the cookies rest on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.