Preheat oven to 180℃ and line tray with baking paper
In a bowl, mix the Nutella, sugar and egg together. Gradually add in the olive oil and mix until mixture is consistent and creamy.
Add in the choc chips and sprinkle a bit of sea salt. Mix well.
Scoop spoonfuls of the mixture onto an oven tray. Don't forget to leave a space in between as the dough will expand slightly.
Bake for 8-10 mins. Cookies should be slightly darker brown around the outside. Remove from oven, sprinkle a little bit of sea salt on top of each cookie and leave to cool.
The cookies should firm up once cooled. Serve.