Preheat the oven to 180°C in static mode.
Beat the eggs with the sugar until they are light and fluffy.
Add the oil, coconut yogurt, and vanilla extract. Mix until combined.
Add the all-purpose flour (farina 00), potato starch, coconut flour, and baking powder. Mix carefully until smooth.
Pour the mixture into a buttered and floured 24cm donut mold (or use a spray release agent).
Add the Nutella to the surface of the batter and bake for 40 minutes.
Once cooked, let the donut cool, then turn it out onto a tray.
Decorate with grated coconut and enjoy!