Preheat oven to 180C (160C fan-forced). Line a 20cm round spring-form cake pan with baking paper and set aside.
Place eggs into mixing bowl and beat on high speed until the mixture triples in volume. This will take 5-7 minutes.
Spoon Nutella into a medium glass bowl and microwave for 15-20 seconds until it is soft.
Spoon one third of the egg mixture and fold using a metal spoon to mix in Nutella until entirely combined. Continue with another third of egg mixture and then again until all the egg and Nutella is combined.
Spoon mixture into cake pan and bake for 25-30 minutes or until a skewer placed into the centre comes out clean.
Cool cake in pan entirely, before removing from pan. Slice and serve.