Pre heat oven to 200C/400F. Core apples and slice. Put into oven proof dish add 1/2 cup of flour and sugar

To make crumble put 2 1/2 cup of flour into mixing bowl, add Brown sugar and butter and cinnamon rub between your fingers until it resembles sand.

Place crumble mixture on top of apples and bake covered for 35 minutes at 200C/400F, then remove cover and continue baking for a future 10 minutes until golden brown and bubbly.