Nutella roulade cake!

One of my daughter favourite cakes is "Rotolo alla Nutella",
that my mother used to prepare for her when she went visiting.
Here is the recepe that you can find also in Italian in my book
"Memorie d'infanzia".

NUTELLA ROULADE CAKE


Ingredients for 4 people:
3 eggs
100 g white sugar
3/4 TBS milk
60 g flour
60 g potato flour (if you don't have it, add more flour)
1 pinch of salt
half tsp of baking powder
Nutella

In a bowl beat egg whites to obtain soft peaks.
In another bowl mix sugar and egg yolks till creamy.
Add milk, flours, salt and baking powder and mix well.
Pour mixture in a baking tray lined with parchment paper.
With a spatula spread it to a rectangular shape.
Bake at 350 F or 180 C for 15 minutes.
Once out of oven, cover it with a wet cloth and turn it upside down.
With the help of cloth roll sponge cake and let it rest for 30 minutes.
Unroll it, spread it with Nutella and roll it again tightly.
Sprinkle it with confectionary sugar or spread top with whipped cream.