In a saucepan, heat butter over medium heat. Stirring constantly until the butter begins to foam and turns a golden brown. It will smell nutty. Take butter off the heat as soon as it begins to foam and allow to cool completely before using.
In a large mixing bowl, combine the cooled brown butter, brown and white sugar, and whisk until combined. Add in the egg and egg yolk, and vanilla. Mix until combined and smooth.
Add the flour, baking soda and salt. Using a silicone spatula to mix until just combined and there is not streaks of flour.
Carefully fold in the chopped pecans and chocolate chips
Using a 1-ounce cookie scoop or spoon, portion out the cookie dough and roll each scoop into smooth balls with your hands. Place them on a baking sheet, then chill for at least 30 minutes or overnight.
When you're ready to bake, preheat the oven to 350°F degrees. To a parchment lined baking sheet, place the cookie dough 2-3 inches apart.
Bake for 10-11 minutes. As soon as they’re out of the oven, place a bowl over the cookies and give them a little swirl to get that perfect round shape. Allow to cool at least 10 minutes before enjoying!
