Preheat the oven to 200 °C / 392°F.
Line the baking tray with parchment for easy cleanup.
Open the puff pastry sheet over a lightly floured surface to prevent sticking.
Roll the sheet to a 16 x 16-inch square.
Cut the puff pastry in half both ways so you have four large squares (8 x 8-inch squares).
Now cut each square into four (4 x 4-inch squares). Making it a total of 16 squares.
Place the squares on the parchment-lined baking tray.
Add a heaping tablespoon of Nutella in the center of each square.
Brush the edges with water - very lightly dab with water.
Fold one side over the other - this will give you a triangle.
Make sure the edges are sealed well so the Nutella stays in when baking.
Once all the squares are filled and sealed, bake in a preheated oven for about 10 to 12 minutes.
Once baked, cool on a cooling rack.
