Take your dish with the apple mixture in and spoon the crumble topping on top. Aim for 50% apple on the bottom, with 50% crumble topping on top.
Place the ramekins (or dish) on a baking tray and cook in a pre-heated oven at 200°C for around 20 minutes.
They are ready when the topping is just turning golden brown.
Serve with ice-cream or custard.