These brownies are really delicious (even as a non-Gluten free person).  They come in a 9x9 pan.  

Ingredients - Cane sugar, specialty flour blend of tapioca starch and rice flour, cocoa processed with alkali, baking powder with sodium acid pyrophosphate, baking soda, cornstarch, monocalcium phosphate, natural vanilla, salt, egg, and vegetable oil