Like I said earlier, I would make the crumble and use it to top the already cooked apples. You can integrate it with your spoon as you eat it. If you want your apples warm, zap them separately in the micro, then layer it in a serving dish.
Crumble: oatmeal, nuts, butter, brown sugar, cinnamon, cloves, nutmeg. spread on cookie sheet and bake. stir. Like making granola.