I had the stuff around the house waiting to try this one and did it today, but it didn't work out for me. I put it into two 9inch square pans, figured that was larger than a 9x 13 so no run over. It ran over anyway, which was no big deal since the oven is self cleaning. Managed to clear the smoke from that one and pulled them out of the oven. Looked wonderful, and the edges which has spilled over (my husband called this Cake Jerky) were nice and chewy and tasty. But within a few minutes the whole thing sunk in and it looked more like pudding.
I did a lot of looking on the net for two ingredient cakes and there are bunches of them, maybe it was the pie filling I used or the pan, so I won't give up. I saw one using lemon cake mix and sprite that sounds pretty good. Try googling two ingredient cakes.