This recipe is as easy as it gets. Preheat oven to 350 and wash your hands - you're gonna get messy.
Pick your fruit first and get it ready. If it's apples, peel, core and chop (I cheat...I've got an old school cast iron peeler-corer-slicer). No matter how you manage whatever fruit you choose, you'll need 4 cups.
Then take 1 cup butter (life's short - bake with butter) or margarine, 1 cup rolled oats, 1 cup brown sugar and 1 cup multigrain flour. Put it all in a bowl and mash it up by hand, squeezing the mixture through your fingers until its all uniform.
Grab a handful and mix it in with the fruit in a suitably sized baking pan. Still using your hands, crumble the remaining mixture over top of the fruit, pat down VERY LIGHTLY and toss in the oven for 30-35 minutes. Keep an eye on it - you'll know when it's ready.
Works well with: Apples, Blueberries, Peaches, Raspberries, Strawberries, Blueberries, Blackberries and any combination of your favourite fruits.
Add a dash of: Cinnamon if you want. Ice cream is a must. But don't bake the ice cream - put it on after you bake the crumble.