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 30 mins or longer. Drop by 2 ounce mounds onto parchment. (If you like extra chocolate, place a few more chips in the top but beware that's a lot of chocolate!) Place in oven and IMMEDIATELY lower temp to 375. Bake 9-11 minutes or until tops golden. Let cool on cookie sheets.