First, turn on the oven and preheat it to 200 °C. Now turn your attention to the dry ingredients: Sugar, flour and oat flakes. Put them in a bowl and mix well. Add some of the cold butter in small pieces and knead the mixture with your hands until the butter and the dry ingredients are well combined. Spread the crumble on a baking tray with baking paper - and put the tray into the oven. Meanwhile, peel the apples, remove the core and cut them into cubes. The crumble is ready after about 15 - 20 minutes - or when it is golden brown.
Melt some butter in a frying pan over medium heat - fry the apple pieces for about 5 - 7 minutes. Then add sugar, cinnamon and the balsamic apple vinegar - and mix well. After you have mixed everything, reduce the heat and let the mixture simmer for about 10 - 15 min. until the apples are caramelized and golden brown. It's best to stay on the stove so nothing burns. That would be a shame.
Continue with the cream: In a mixing bowl, whip the whipping cream until peaks form. Then add the vanilla sugar and gradually whip the cream until stiff. Now carefully fold in the yogurt - the airiness of the cream should not be lost!
Now start layering the dessert in beautiful glasses of your choice. The first layer is the caramelized apple pieces. Spread a layer of crumbles on top and then add the third layer of yogurt cream. Repeat until the glass is well filled.
Almost done: Finally, spread a few crumbles and apple pieces on the yoghurt cream to have a nice looking topping. Put the layered dessert in the fridge until your guests arrive. An impressive dessert can be this simple.