Drain the curd well. Put it in a mixing bowl with oil, milk and salt and mix. Mix flour and baking powder and work into the quark mixture with the dough hooks of the hand mixer. With cool hands quickly knead to a smooth dough. (Do not knead for too long, otherwise the dough becomes sticky.) Peel the skin off the sausage. Halve the dough and roll out on a floured work surface so that you can wrap one sausage in each.
Coat dough plates with mustard. Place sausage on top and wrap with dough. Whisk the egg yolk and some water and brush the dough with it. Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 25-30 minutes. Arrange filled breads on parsley leaves