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Preheat oven to 200 degrees
Mix the flour, baking powder and the bastard sugar
Melt the butter in a pan
Mix the oatmeal with the flour, baking powder and sugar and add the melted butter.
Mix this with a mixer with dough hooks until it is granular
Butter the baking tin and put half of the granular dough in the baking tin.
Spread it flat on the bottom with a spoon and don't forget to make an upright edge as well
Then put the apple slices you sprinkled with cinnamon and vanilla sugar on the bottom and divide the rest of the dough on top of the apple slices.
Place the rest of the dough with your hands over it
Put some shaved almonds on top of it
Bake in the oven for 30 minutes
And, uh... ...have a feast...