How to cook
Mix the eggs with the sugar. Beat the mixture well and add the yogurt. Add the baking powder or the baking soda, extinguished in the yogurt ahead of time. Optionally, add the powdered cocoa.
Add the flour, mix into a homogeneous mixture and bake at 356°F (180 °C).
Melt the chocolates and smear 1/2 of the mixture with white and the other with the milk chocolate.