Brown sugar is granulated sugar combined with molasses to make a soft, richly flavored sweetener. Two main types are available, light and dark. Light brown sugar, also called golden, contains a relatively small amount of molasses and gives a delicate yet distinctive flavor to breads. Dark brown sugar has a higher molasses content and is moister with a more assertive flavor. Measure brown sugar by firmly packing it into a measuring cup. It should retain the shape of the cup when tapped out.