Mary Bergin, head pastry chef for Spago at Las Vegas, demonstrates how to make two types of chiffon cakes, a nectarine upside-down lemon chiffon cake and a chocolate chiffon bundt cake with crème brulee. One of her many tips: The colder the eggs are, the easier they are to separate.

Mary Bergin, of Las Vegas, NV, demonstrates how to make a vanilla chiffon cake with a twist—a full vanilla flavor and a thin, flexible shape, ideal for rolling with chocolate-laced walnut mousse.