Preheat oven to 375°.

Melt 10 T. butter in a large skillet over medium-high heat. Swirl constantly for another 2-3 minutes, until dark brown flecks appear and it smells wonderfully nutty.

Remove skillet from heat and pour butter into a large mixing bowl. Add remaining 4 T. butter and stir until completely melted.

Whisk in sugars, salt, vanilla, egg, and egg yolks.

Let batter stand for 3 minutes, whisk for 30 seconds, and repeat twice more. Batter should be shiny and completely smooth.

Fold in baking soda and flour, mixing only until incorporated. Fold in chocolate chips.

Divide dough in 16 balls. Arrange 8 balls evenly on one parchment-covered baking sheet.

Bake one sheet on center rack at 375° for 10-12 minutes, until golden brown and puffy. Set baking sheet on wire rack to cool and repeat with remaining dough.