I made this at work for the kids and they LOVED it.
I made it with a vanilla cake mix and vanilla icing, because that was all I had.
1 cake mix
1 can icing
2/3 cup veg oil
3/4 cup water
4 eggs
Spray 9x13 pan well. Mix all ingredients and add to pan. Tap pan on countertop a few times to get up air bubbles. Bake at 350. I turned mine at 25 minutes, but it took about 50 minutes to be done in my oven. I'd check after 45 with a tooth pick to be sure.
Don't try to take it out of the pan before it's cool.
Definitely didn't need to be iced.
Watson