Preheat your oven to 350ºF. Unwrap the thawed puff pastries and, on a clean surface, gently roll both sheets out slightly to get an extra pastry or two. Ensure they are similar in size and not too thin.
Spread the hazelnut spread evenly over one puff pastry sheet, covering it to the edges. Place the other puff pastry sheet on top, aligning the corners.
Use a pizza cutter to cut even 1/2-inch strips from the sandwiched pastries.
Twist each strip and place them on a parchment-lined baking sheet, shaping them into swirls. Beat the eggs in a small bowl and brush the pastries generously with the egg wash. Bake for 10-15 minutes until golden brown and flaky.
Let the pastries cool for a few minutes, then dust them with powdered sugar. Enjoy immediately for the best flavor.