Believe it or not, it is possible to make great holiday cookies from widely available high-quality ready-made dough. No sifting, no measuring, no creaming of butter, no shards of eggshell at the bottom of the mixing bowl. Just roll the dough out, cut into shapes, bake, and decorate. You can turn out cookies by the baker's dozen and still have time left over to go sledding. Our favorite: Pillsbury Sugar Cookie Dough, available in supermarkets.