Preheat oven to 350 degrees. Line cookie sheets with parchment.

Beat butter and both sugars until well blended.

Add in vanilla, egg and yolk until light and creamy.

Add in flour, salt and baking soda just until incorporated.

Stir in chocolate chips by hand. Chill if you have time.

Drop by 1/4 cup amounts onto parchment.

Mine baked 14-16 minutes …until edges are browned and centers no longer look wet. Cool completely on sheets.