Preheat the oven to 160°C (320°F) and position the baking rack in the middle of the oven.
Transfer the biscuits onto a baking tray lined with baking paper. Bake for 10-11 minutes, remove from the oven and let them cool down on the tray.
Fill a piping bag fitted with a small nozzle (about 2 mm) with the Nutella®, pipe 5g of Nutella® on half of the biscuits and assemble with the other half.
Eventually, decorate your sandwiches with Nutella®.