This muffin recipe is great for a holiday breakfast, brunch, or snack, and it also comes in handy if any of you happen to have eggnog left over after the holidays. I always buy eggnog every year—it doesn’t seem like the holidays without it—but I always end up with extra. And it’s so rich, you can’t really drink a lot of it. So baking with it seems like the perfect way to finish using it up.