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In a medium bowl mix sugar and yolks of eggs
Work on the eggs for several minutes, so the cake will be softer.
Add flour, potato flour and baking powder.
In the mean time add softened butter at room temperature and mix. Add milk and mix.
Separately mount the four egg withes until stiff and then add them to the mixture.
Stir the mixture up and down, being careful not to remove the compound. Put the mixture into a buttered pan or, if you prefer, cover the pan with parchment paper.
Put in preheated oven at 180 for 50 minutes. Decorate with icing sugar