Prepare the loaf tin by rubbing butter on the inside and lining it with baking paper.
Add the eggs, milk, and oil into a mixing bowl. Mix until combined.
Sift the self-raising flour and baking Soda into a bowl, add unsweetened dark cocoa powder, and mix. Add this to the egg mixture and stir to combine.
Add hot water and mix the cake batter till smooth. then add 3/4 of the chocolate chips to the cake batter and mix.
Transfer the cake batter to the lined Loaf tin. Top with the remaining chocolate chips.
Bake the cake in the oven at 160C for 60 minutes or until baked (when it is fully baked, a skewer when inserted in the middle will come out clean).
Let it cool in the pan for 5 minutes, then turn it onto a cooling rack to continue to cool.