I have to agree that this is probably the easiest fruit cobbler ever, although I want to share my version of it with you.
Sub Trader Joe's chunky cinnamon apples for the 2 cans of pie filling
Sub any GF mix you like (biscuit with a little added sweetener, TJ's GF brownies, whatever you have on hand) for the box of yellow cake mix
Vegan margarine for butter (although I don't melt it, I fling slices of it around on top and it does just fine)
The chopped nuts remain optional as are my sprinkle of cinnamon or vanilla sugar on top.
I highly recommend you give it a try. Each combination results in something tastier than the last it seems!