How to cook
Whip the eggs with the sugar, oil and yoghurt.
Add 1 of the chocolate bars that you've melted in a water bath and the sifted flour with baking powder.
Bake at 374°F (190 °C) until your toothpick comes out dry.
Once baked, pour the other chocolate bar that you've melted in a water bath with a little oil over it.