A blondie is a rich, sweet dessert bar. They are made from flour, brown sugar, butter, eggs, baking powder, and vanilla. Chocolate chip blondies may contain white or dark chocolate chips, but the dominant flavor of a blondie is brown sugar

Brown sugar

Brown sugar is a sucrose sugar product with a distinctive brown color due to the presence of molasses. It is either an unrefined or partially refined soft sugar consisting of sugar crystals with some residual molasses content, or it is produced by the addition of molasses to refined white...

, not chocolate. They may also contain walnuts or pecans. Even though butterscotch is sometimes considered the main flavor, they are based on brown sugar and often do not call for butterscotch.

Blondies are a brown sugar based dessert bar resembling the traditional chocolate brownie

Chocolate brownie

A chocolate brownie is a flat, baked square or bar introduced in the United States at the end of the nineteenth century and popularized in both the U.S. and Canada during the first half of the twentieth century. The brownie is sliced from a type of dense, rich chocolate cake, which is, in texture,...

. They are baked in a pan in the oven similar to how traditional brownies are baked, then cut into rectangular shapes for serving.
They are sometimes referred to as blonde brownies, although are based from brown sugar, unlike brownies made with cocoa.

Like brownies, blondies may include chocolate chips. They may also contain coconut, nuts, toffee, or any other chunky candy for added texture. Blondies aren't usually frosted; the brown sugar flavor tends to be sweet enough.

Another popular variation is the Congo bar, which contains chocolate chips with either walnuts or coconut.

Blondies are sometimes served in sundaes, often topped with caramel sauce.