A brownie is a flat, baked dessert square that 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. It is a cross between a cake and a soft cookie in texture and comes in a variety of forms. Depending on its density, it may be either fudgy or cakey and may include chocolate chips, nuts, or other ingredients. A variation made with brown sugar and chocolate bits but without melted chocolate in the batter is called a blonde brownie or blondie.
—Chocolate brownie from Wikipedia, the free encyclopedia