In this recipe, in particular, beating the butter and sugar until light and fluffy will make all the difference in the resulting texture. Beating room-temperature butter with sugar incorporates quite a lot of air into the mixture—more air than you might imagine. And no air means no fluffiness. For best results, beat butter and sugar together for 1 to 2 minutes--this is especially important because there are no leaveners in the batter and the only rise you get is from what you incorporate with your beaters.