Brown 2 sticks plus 2 Tablespoons unsalted butter in saucepan. Once butter is browned, place in a bowl to cool slightly.
In Kitchen Aid, cream the remaining 2 sticks of butter with the granulated sugar. Cream on medium speed until light and fluffy, 3-5 minutes. Add the vanilla and beat until incorporated.
Once the browned butter has cooled slightly, pour into creamed butter mixture with the brown sugar. Cream for about 2 minutes until well incorporated. Add the eggs and egg yolks and beat for 1 more minute.
In a medium bowl, whisk together flour, salt and baking soda. Add the flour mixture all at once to the butter mixture and mix on low until just incorporated.
Remove the bowl from the stand mixer and fold in chocolate chips.
Cover with plastic wrap and put in fridge for 30 min.
Preheat oven to 375. After dough is chilled, scoop cookies onto a lined cookie sheet using a 1.5 inch scoop.
Bake 10-11 minutes or until lightly browned but still soft in the middle.