How to make
Combine the flour, sugar, baking soda and cocoa in a bowl. Beat the eggs with the yoghurt, oil and butter. Add the liquid ingredients to the dry and stir until evenly mixed.
Optionally, add slightly crushed walnuts or other nuts that you like to the cake mixture. Transfer the mixture into a greased, floured baking dish and bake in a preheated 390°F (200 °C) oven.
For the glaze, mix the cocoa and powdered sugar with some water, just enough to get a mixture going. Cut the prepared cocoa cake into pieces and cover with the glaze. Enjoy!