Melt butter and let it cool.
In a bowl knead with an electric hand mixer eggs with sugar and add yogurt and cream.
In another ball blend flours, starch and baking powder, add the mixture with eggs and blend with flours and continue to blend at low speed. In the end pour butter and combine until the batter will be smooth and uniform.
Grease with butter and flour a mould (diameter 20-22 cm or so) and pour the batter.
Bake in fan-assisted oven to 165°C for 40 minutes or so.