Preheat the oven to 180°C.
Cut the apples into small chunks, then scatter them into a baking dish. Add the raisins, dates, hazelnuts, cinnamon, sugar and toss well.
Pour over the apple juice and rest.
In a bowl, mix the flour and cinnamon together. Rub in the margarine until the mixture resembles coarse crumbs, then mix in the oat and sugar. Gradually add the oat milk and mix with a palette knife, until you get a sticky, wet dough.
Make balls from the dough and put them over the apple mixture, tightly next to each other.
Bake in the middle of the oven for about 35-45 minutes, until it looks golden.