They call this a dump cake for a reason. And for being a dump, man is it good!
canned pie filling (or 2)
yellow cake mix
Preheat your oven to 350F. Spray your baking dish. Dump your pie filling (I used cherry) into the dish. Depending what size your pan is you may need 2 cans. Dump, evenly, the box of yellow cake mix over the top. Slice chunks of butter and randomly put it on the cake mix. Put it in the oven for, oh, about 20 minutes. I really don't know how long. Pull it out when the cake mix is a lovely golden yellow and the pie filling is bubbling around the edges. Let cool for a few minutes, if you can.
My favorite part is the "crust" aka the cake mix. YUM!