Mix the flour, eggs, milk, honey and salt together. Bake 12 thin crepes in oil. Scrape out the vanilla stick. Mix the quark, honey, vanilla pulp and egg yolks together. Fold in the muesli and blueberries. Spread the filling on the crepes and fold them into "packages". Bake in a greased pan covered with aluminum foil for about 15 minutes at 180 degrees fan-assisted. Dust with powdered sugar and serve.