Since this only makes one layer, would you need to double it to make a 9 by 13 version? I think you could get by by making 1 1/2 times, but doubling is easier math -wise. You would have some batter left for cupcakes. Mary@ KAFI'd double it to make it in a 9" x 13", so long as your 9" x 13" is 2" deep. PJH
May 25, 2010 at 1:02pm