Blondies differ significantly from white chocolate brownies. Unlike the white chocolate brownie or the normal brownie, they contain no chocolate or chocolate flavouring, other than chocolate chips, which may be included. They may also contain coconut, nuts, toffee, or any other chunky candy for added texture. Blondies are not usually frosted; the brown sugar tends to be sweet enough. A variation is the Congo bar, which contains chocolate chips with either walnuts or coconut.
They are baked in a pan in an oven in a manner similar to that of the baking of traditional brownies, then they are cut into rectangular shapes for serving. Blondies are sometimes served in sundaes, often topped with caramel sauce.
A US patent 4774099 A, Robert D. Feeney; Robert L. Prosise & Joseph McGrady et al., "Process for making brownies containing cellulosic fiber", published 27 September 1988, assigned to The Procter & Gamble Company