-Adjust oven racks to upper & lower -middle positions & heat oven to 325. Line cookie sheets with parchment paper.
-Whisk dry ingredients together; set aside.
-With electric mixer, or by hand, mix butter & sugars until thoroughly combined.
-Beat in egg, yolk and vanilla until combined.
-Add dry ingredients & beat at low speed just until combined. Stir in chips.
-Roll scant 1/2 cup dough into ball. Holding dough ball in fingertips of both hands, pull into 2 equal halves. Rotate halves 90 degrees and, with jagged surfaces facing up, place formed dough onto cookie sheet, leaving ample room between each ball.
-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 & puffy (about 18 minutes in my oven).
-Cool cookies on sheets until able to lift without breaking and place on wire rack to cool.
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