In a bowl, combine the almond flour, sugar, vanilla sugar, and heavy cream until you have a thick, creamy filling.
On a lightly floured surface, roll out the puff pastry into a thin sheet.
Sprinkle breadcrumbs evenly over the center of the pastry to absorb excess moisture from the almond filling during baking.
Spread the almond filling evenly over the center of the pastry, then sprinkle with slivered almonds.
Fold the edges of the pastry over the filling, then turn it over so the seam is on the bottom. Brush the top with beaten egg and sprinkle with more slivered almonds.
Preheat oven to 350°F (180°C) and bake the strudel for 25-30 minutes, or until golden brown.
Let it cool before slicing. Dust with powdered sugar and serve.
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