There's something incredibly comforting about a bran muffin. The flavor is wholesome and sturdy; just sweet enough to be a treat, but not so sugary as to induce guilt. For a portable breakfast, they're hard to beat. This recipe can be made up and held in the refrigerator, unbaked, for up to a week. You can scoop as many (or few) muffins as you need, so you'll always have a fresh, warm muffin when you want it. Please note that this batter needs to be made a day in advance, so the bran can soften and the batter thicken.