Preheat oven to 200 degrees.
Mix all the ingredients for the base well and layer the bottom of a small glass pan.
For the crumble toppking, add the flour to sugar to the butter and mix with fingers till it resembles breadcrumbs. Top it evenly on the apple mixture.
Bake for 35 to 40 minutes till the apples get cooked. Serve warm with custard or ice-cream. It is really good as it is!