Preheat oven at 350ยบ Fahrenheit.
Peel apples and cut them into cubes and spread them out evenly in a dish. Add the optional cinnamon.
Place the flour, the sugar, and the butter in a bowl and mix with your hands until clumps form.
Spread the flour, sugar, and butter mixture over the apples, spreading it evenly.
Bake for 1 hour.
Enjoy!