Preheat oven to 400ºF/200°C and line a large baking sheet or pizza pan with parchment paper.
Thaw puff pastry according to package instructions. Make sure the pastry softens but remains cool.
Using a large plate or the base of a 9 inch springform pan as a guide, cut each sheet into a circle.
Place one circle of puff pastry onto the line baking sheet or pizza pan. Use a knife to spread all of the Nutella over the pastry leaving ¼ inch border around the edge.
Carefully top with the second circle of puff pastry and press down lightly so that it sticks. If the pastry is very soft and not cool at this point, give the pastry 10 minutes in the freezer to chill and become firm.
Place a small glass (2 or 3 inch)in the centre. Use a sharp knife and cut first into quarters. Cut each quarter in half to make eighths then each of those in half to make sixteen cuts.
Lift two pieces and twist them twice in the opposite direction and pinch the ends to form a point. When you have finished, brush with egg wash.
Beat the egg lightly with 1 teaspoon of water and carefully brush over the pastry.
Bake for 20-30 minutes until well browned and puffed.
Cool slightly on a wire rack.
Dust with powdered sugar and enjoy!
Notes
Tips for Success
Thaw the pastry so it’s pliable but still cool to the touch.
Use a sharp knife (or a pizza cutter) to cut the puff pastry cleanly.
Slightly warm the Nutella in a small bowl in the microwave if it’s too thick.