Preheat the oven to 180°C (356°F).
Dice the apples, then mix them with lemon juice, sugar, and cinnamon powder.
In a bowl, combine flour, butter, and sugar, and mix by hand until crumbly.
Place the apples in a baking dish and sprinkle the crumble dough on top.
Bake in the oven for 30 minutes until golden brown.