With an electric mixer, beat the butter and brown sugar on medium-high speed until light and fluffy, 2 to 3 minutes. Beat in the eggs. Reduce speed to low and gradually add the flour mixture, mixing until just incorporated.
Form the dough into balls (each equal to 1 level tablespoon). Roll the balls in the confectioners’ sugar and place on parchment-lined baking sheets, spacing them 2 inches apart. Bake until the cookies are firm and the tops crack, 13 to 15 minutes.