When you need an on-the-go breakfast (and these days, when don't you?), a packaged bar is an obvious solution. No utensils needed, it's not messy, and you can eat one while driving, walking or in a packed subway car. “It wouldn't be my number one choice,” says Keri Gans, R.D., author of The Small Change Diet, “but I'd rather someone grab a bar than skip breakfast altogether or grab a doughnut. A lot of bars do have some nutritional value.” But not bars are created equal. Here are 10 of the best bars and why these outshine the rest.