1. Heat oven to 325º . Mix flour, salt and baking soda together in medium bowl; set aside.
2. Either by hand or with electric mixer, mix melted butter and sugar until thoroughly blended. Mix in egg, yolk and
vanilla. Add dry ingredients; mix until just combined. Hand stir in chips.
3. Shaping cookies:
Roll dough into ball. Holding dough ball using fingertips of both hands, pull into two equal halves. Rotate halves
90º and with jagged surfaces exposed (up) joining halves together at their base, again forming a single cookie.
4. Bake until cookies are light golden brown and outer edges start to harden yet centers are still soft and puffy.
15-18 minutes. Cool cookies on cookie sheets (they will bake a bit more as they cool).