Cook like james

Makes 24 cookies. 1 cup unbleached all-purpose flour (5 ounces) ¾ teaspoon baking powder. ½ teaspoon baking soda. ½ teaspoon table salt. 14 tablespoons unsalted butter (1 3/4 sticks), softened but still cool, about 65 degrees. 1 cup granulated sugar (7 ounces) ¼ cup packed light brown sugar (1 3/4 ounces) 1 large egg. 1 teaspoon vanilla extract ................
................