Preheat your oven to approximately 180°C and grease a baking dish.
Peel your apples and then cut them into small cubes, approximately 2 cm in length.
Put your flour, sugar, lemon juice and cinnamon into a bowl along with your diced apples.
Mix thoroughly then spread it across your baking dish.
Place all of your topping ingredients into a bowl and mix it until it starts to form clumps.
Once the mixture has been thoroughly mixed, place it over the top of your apple layer. You should be crumbling the topping over the apple layer.
Bake the dish for 30 to 40 minutes or until you can see it has turned golden brown.
Remove the dish from the oven and wrap it in foil to rest for 10 minutes.
Serve the desert warm with some vanilla ice cream for the maximum crowd pleasing experience!