This is an easy, every day, family-style cake, and isn’t too rich. It is perfect for lunchboxes and lovely served with some berries.
Preheat the oven to 170°C/150°C. Lightly spray a 22cm cake tin with oil and line with baking paper.
Combine the flour, sugar and cocoa in a large mixing bowl. Make a well in the centre. Whisk in melted butter, yoghurt, egg and milk until mixture is smooth. Spoon into the prepared tin.
Bake for 1 hour 15 minutes. Once cooled sprinkle with icing sugar.