A chocolate brownie or simply a brownie is a square or rectangular chocolate baked confection. 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 brown sugar and vanilla rather than chocolate in the batter is called a blond 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.