1/2 teaspoon baking soda
1/2 teaspoon salt
3/4 cup unsalted butter, melted
1 cup packed brown sugar
1/2 cup white sugar
1 tablespoon vanilla extract
1 egg yolk
2 cups semisweet chocolate chips
Preheat the oven to 325 degrees F (165 degrees C). Grease cookie sheets or line with parchment paper.
Sift together the flour, baking soda and salt; set aside.
Roll a scant half-cup of dough into a ball. Holding dough ball in fingertips of both hands, pull apart into two equal halves. Rotate halves 90 degrees and, with jagged surfaces facing up, place formed dough onto cookie sheet (Or just put a dang ball of dough on the cookie sheet!). Bake, reversing position of cookie sheets halfway through baking, until cookies are light golden brown and outer edges start to harden yet centers are still soft and puffy (approximately 11-14 minutes). Do not overbake.
Cool cookies on sheets until able to lift without breaking. Transfer to a wire rack to cool.