When mom isn't looking, pop a handful of this dry mixture in your mouth.
Melt 1/2 cup of butter (more or less) and pour over the dry mixture. Blend butter and dry ingredients until you have nice crumbles. Butter a baking dish and layer cooked fruit in the bottom of the pan about an inch deep. We've cooked apples, pears and rhubard with honey and cinnamon in the microwave(separately). We've also just used applesauce. Canned fruit might be good, too.
Layer the crumbles on top and bake at 350 for 30-45 minutes. The top should be browned lightly. The house will smell wonderful when it's ready.