It may seem like an oxymoron, but there is such a thing as an "easy birthday cake," and this recipe is proof positive of that idea. It earns that moniker by being mixed together with an electric mixer following the basic technique: Cream butter and sugar, add eggs one at a time, mixing well after each, and then adding the dry ingredients while beating until combined. Only here the recipe calls for raising the mixer speed to high and beating for a full minute. Bake, split, and fill with whipped cream topping.