Microwave apple crumble

First cut the apple into small cubes and add cinnamon to taste and the juice of half a lemon, mix well.

We add it in a microwave container and put 2 minutes at maximum power to roast the apple.

Then melt a stick of butter and mix it with the oatmeal.

We can also add a little cinnamon to the oatmeal and butter.

Put the oat mixture over the baked apple cubes and put in the microwave for another 2 minutes at maximum power.

If we have a gratin function in the microwave we can put another minute more in this function.

And it is ready! Serve and if we want to add some crushed walnuts on top.