Melt the butter and pour it into a bowl, add the sugar and cocoa powder, mix it
Now add the eggs to the above mixture along with vanilla extract and whisk it till it is shiny. It should take about 4-5 minutes.
Now sift the flour ,salt and baking powder into the egg mixture and fold into it.
Finally add the yoghurt and chocolate chips into the batter. Pour it into a cake tin lined with a greaseproof paper or baking paper.
Bake this in a preheated oven or microwave oven (convection mode) at 165℃ for 28-30 minutes. A toothpick when poked after baking, will s have a little gooey mixture stuck. Cool and cut into pieces.
P.S : for the eggless version, please replace the eggs with one banana. Rest everything remains the same.