Preheat oven to 425 degrees. Lightly grease a baking sheet. Unfold the puff pastry on a lightly floured surface, and roll out to a rectangle of about 20x9 inches. Spread the chocolate hazelnut spread over the pastry, and then scatter hazelnuts over the top. Roll the long sides of the pastry rectangle toward the center; where they meet in the center, dampen with water to secure. Using a sharp knife, cut into about 1/2-inch slices; place in the baking sheet, and sprinkle with powdered sugar. Bake in preheated oven until golden brown, about 10 to 15 minutes.
Ready in 20 min