Sieve your flour and sugar and baking powder
Now add in your mashed banana and butter I made a puree out of the bananas so I done 2/4 cup of banana puree and 1/4 cup of normal mashed bananas.
Now mix until smooth. Note that if you used bananas, it won't really be smooth.
In a separate bowl add your boiling water to make a slightly stiff paste with the Cocoa powder.
Add this paste to your cake mixture
Mix well
Now pour evenly across cake tin I used 2 tins
Pop into the oven for 15-25 mins at 180°c
To know when ready, stick a toothpick into the centre if it comes out clean, it's done!
One of my cakes broke (As seen in picture above) but that's fine as I just iced it back together!
