Pre-heat your oven to 190°C (375°F).

In a pot, add all the ingredients for the apple filling, except the corn flour and water mixture. Mix together and place the pot on medium heat. Cook until the apples are soft to your preference.

Pour the corn flour and water mixture into the apple filling, mix in, and heat while stirring until the mixture thickens (around 30 seconds). Leave aside.

In a small bowl, add all the ingredients for the crumble, except the butter, and mix together.

Pour in the melted butter and mix until you get a crumbly mixture.

In an oven-safe ramekin or small dish, add the apple filling, then add the crumble on top.

Bake for around 15 minutes, or until the crumble has turned golden brown.

Let cool for a few minutes, then top with custard or ice cream and enjoy.