Preparation:

Mix the flour, milk, cream, egg yolks, vanilla sugar, and rum into a smooth batter. Beat the egg whites with a pinch of salt until slightly foamy, then add the sugar and continue beating until stiff peaks form. Carefully fold the beaten egg whites into the batter. Heat a bit of oil in a large pan. Pour in the batter, sprinkle the apple slices evenly over it, and bake the underside until golden brown. Flip it over carefully. Then place the pan in a preheated oven at 200°C (390°F) and bake for about 3–5 minutes. Remove from the oven and tear the Schmarren into pieces using two forks. Dust with powdered sugar, add a bit of butter, and briefly toss everything in the pan on the stove until the sugar caramelizes slightly. Serve on hot plates, dust again with powdered sugar, and enjoy immediately.