Mix the flour, baking powder, sugar, salt and vanilla sugar together. Add the quark, oil and milk. Knead a smooth dough with the dough hook of the hand mixer. Grease the baking sheet and roll out the dough on it.
For the topping, mix the sour cream with the eggs, sugar and the pudding powder. (No pudding is cooked, the pudding powder makes the icing firmer when baking.)
Peel and halve the pears. Remove the core and cut the halved pears lengthways several times on the round side. Spread on the dough and pour the icing over it. Bake in the preheated oven at 175 ° C top / bottom heat for about 40 minutes. Let cool down.