Preheat your oven to 180°C. Line a baking tray with parchment paper or use a silicone baking mat instead. 

Mix the flour, Nutella and egg in a large bowl until well combined. The dough will be still easy to work with and roll and a bit thick. 

Roll the dough into small balls of around 2 tablespoons each and line them on your lined baking tray. Flatten them with your hand slightly with your palm or with a fork, so you can see the impression of the fork on them. 

Bake for 8-10 minutes, until the middle will still be slightly soft and the edges will be cooked. Let the cookies cool down and then drizzle with more Nutella for a quick decoration. Enjoy!