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 21/2 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.