In a large bowl, sift the all-purpose flour, add the dry yeast, sugar, and salt, then mix to combine.
Pour in the lukewarm milk and melted butter, and begin to knead. Work until you have a smooth, elastic dough, then cover and let it rise for 1 hour.
Divide the risen dough into two equal portions, then roll each out into a circle on a lightly floured surface.
Spread the hazelnut cream on one half of each circle, then sprinkle with chopped dark chocolate and ground hazelnuts.
Fold the other half of the dough over the filling, then press the edges together to seal and prevent the filling from leaking out.
Brush the top with beaten egg, and poke a few holes with a fork to allow steam to escape during baking.
Bake in a preheated oven at 350°F (180°C) until golden brown, about 18-20 minutes.
After baking, let it cool slightly, then sprinkle the top with powdered sugar.
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