Step 1

Whisk together flour and baking soda; set aside.

Step 2

Heat 10 tablespoons of butter in a skillet over medium heat until melted about 2 minutes. Continue stirring for another 1-3 minutes until brown and nutty in aroma. Remove from heat. Pour heated butter through a sieve into a heat proof bowl. Stir in remaining butter until completely melted.Add all three sugars, salt and vanilla to bowl with butter and whisk until fully combined. Add egg and egg yolk, whisk until mixture is smooth and no sugar lumps remains, for about 30 seconds.

Step 3

Let mixture stand for 3 minutes then whisk for another 30 seconds.

Step 4

Repeat step four 2 more times until mixture is thick and shiny.

Step 5

Stir in flour until combined. Stir in chocolate chips until combined.

Step 6

Press cookie dough mixture into pan. Bake for about 15-17 minutes or until golden brown and still puffy.