Preheat oven to 200 degrees. Line a baking pan and set aside.
Take on square of puff pasty, spread a tsp on Nutella, put 4 pcs of banana on top of it and then top it with another puff pastry square.
Press the sides using your fingers and cross off with the fork.
Carefully put it on the prepared tray. Repeat with the other puff pastry sheets.
Brush the top of the puffs with the egg wash generously.
Bake for around 20 minutes till golden brown and puffed up. Allow to cool and enjoy!