Found this recipe yesterday and just happened to have all of the ingredients at home and a couple of dinner guests on their way, so I popped it into the oven.
WOW.
Easiest dessert EVAR! And it is so amazingly good (just ask D'zNutz and BerserkerCatSplat!) It takes about 5 minutes from start to oven, then bake it for 45 mins or so and voila! Smells amazing too when it's baking
Peach Crumble Cake
This suggests peaches (which is what I used) but you can do it with any canned fruit...pears, fruit cocktail, pineapple, etc.