Zoe Nathan has the zany, freewheeling air of a person on a permanent sugar high. "It's a huge pastry playground," she boasts of her bakery. Her salted-caramel squares are just as bold, with tender caramel atop a dense, buttery crust. "I've always loved salt and sugar," she says. "As a kid, I'd dip my fries in milk shakes."
Slideshow: More Fantastic Dessert Bars