Ace of Cakes star Duff Goldman is spreading his signature brand of confectionary good news to El Segundo.  Window paper is up on a space in the back development of Plaza El Segundo (730F S. Allied Way) announcing that a branch of Duff’s Cake Mix is on the way.  And what is Duff’s Cake Mix?  According to their website, they are a “do-it-yourself cake and cupcake decorating studio” for parties of one to twelve, as well as for classes, hosting corporate events, and other special occasions.