Place the dry ingredients into a mixing bowl and mix on low speed for 1 minute with a paddle.
In another bowl, combine the vanilla and egg whites. With the mixer running, slowly add the whites and mix for 2 minutes on medium speed.
With a 2-ounce ice cream scooper (or large tablespoon), scoop cookie dough and place onto a non-stick baking sheet pan. Make sure to space the cookies about 3 inches apart (cookies will spread while baking).
Lower the oven temperature to 320° and bake for 14 minutes or until small thin cracks appear on the surface of the cookies. Cool on a wire rack and store in a cookie jar.