Preheat the oven at 200 degrees Celsius.
Cut the chocolate in pieces.
Place the butter and the chocolate in a bowl, put in in the microwave for 30 seconds.
If needed put it another 30 seconds to get the chocolate and butter to melt.
Take out the bowl and mix it together.
In another bowl, with an electrical mixer mix the eggs and sugar.
Add the nutella in the eggs and mix.
Add the chocolate mixture and mix it all together.
Butter a cake form with removable edges.
Sprinkle with some flour evenly in the form.
Pour the batter in the form, place in the middle of the oven for 12 minutes.
Take it out and let it rest for minimum 2 hours.
Before serving whip the whip cream and serve together with the cake.