First preheat you oven to 220C and line a baking tray with baking paper.
All you need is three sheets of frozen puff pastry. Allow to thaw and use a large plate to cut a circle out of each of the sheets. Start assembling on the lined baking tray. Spread one circle of pastry with Nutella, top with another pastry circle. Spread that one with Nutella and top with a pastry sheet. You will have two layers of Nutella and three layers of pastry.
Now take a glass and push it lightly into the centre. With a sharp knife cut first into quarters. Cut each quarter in half to make eighths then each of those in half to make sixteen cuts.
Lift each piece and twist twice. Yep, this bit gets messy! When you have finished, brush with egg wash.
Bake for 20-30 minutes until well browned and puffed.