A chocolate brownie (commonly referred to as simply brownie) is a square, baked, chocolate dessert. Brownies come in a variety of forms and may be either fudgy or cakey, depending on their density. They may include nuts, frosting, cream cheese, chocolate chips, or other ingredients. A variation made with vanilla rather than chocolate in the batter is called a blonde brownie or blondie. The brownie was developed in the United States at the end of the 19th century and popularized in the U.S. and Canada during the first half of the 20th century.