Preheat the oven to 180°C (356°F).
Dice the apples and place them in a bowl, then mix with sugar and cinnamon powder.
In another bowl, combine flour, sugar, and butter, rubbing them together by hand until crumbly.
Place the apples in an oven-safe dish and spoon the crumble mixture on top.
Bake in the preheated oven for 25–30 minutes.