Make the dough. To make the blueberry pie dough, combine the egg and sugar in a bowl and beat until the sugar dissolves. Add cold butter to the flour and rub until crumbly. Combine the flour and butter crumbs with the beaten egg and knead into a soft, elastic dough. Cover the dough with cling film and refrigerate for 30 minutes.
Prepare the filling. To prepare the curd filling, combine the curd, soft butter, eggs, flour and vanilla sugar in a container or blender. Mix or whisk everything well. The result should be a homogeneous and fairly liquid mass.
Prepare the filling. Combine eggs, 100 g sugar and sour cream in a blender and beat until smooth.
Form the pie. Line a baking pan with parchment. Spread the shortcrust pastry over the bottom and sides and form high sides. Place the curd mass on the dough and smooth it out. Place the blueberries on top of the curd mass and sprinkle the berries with 2 tbsp. of sugar. Pour the sour cream filling over the blueberries.
Bake the pie. Put the cottage cheese and blueberry pie in a preheated oven and bake at 180 degrees for about 50 minutes. Cool the finished pie without removing it from the pan. Then transfer it to a plate.