All you do is put some fruit in a pan, and pour cake mix on it. Then you top it off with a can of SODA and toss it in the oven.
And the ad is great . . . just because of how many times they say the word "DUMP". And there's also an extra cookbook you get with it called "Dump Dinners."
(Search for "Dump Cakes Infomercial with Cathy Mitchell." At 1:04, a woman gives a testimonial about how easy it is to just "dump and bake". And they talk about the "Dump Dinners" cookbook at 1:18.)