I used 2 cake mixes in a large pan that my neighbor gave me. She said it could hold 2 mixes, but I had never tried it before. As it was baking it started rising higher and higher and I started panicking. I thought for sure it was going to spill out of the pan and all over my oven. It got right up to the tippy top and even a little higher, but never did overflow. Thankgoodness!!!
And here is the finished cake!