Sift together the flour, potato starch flour and baking powder and set aside.
In a large bowl mix together for about 8 minutes, the eggs with the sugar and a pinch of salt, until the mixture is smooth and frothy.
Add the oil and then the milk, in a thin stream. Add the sifted ingredients a little at a time and mix well. As soon as the ingredients are all perfectly mixed, divide the mixture into two equal parts and add Cioccodelizia Fondente Babbito one and Cioccodelizia Bianca Babbi to the other. Mix the two mixtures well so that they are smooth and uniform.
Pour the mixture into the muffin pan and bake for about 35 minutes or until cooked through.