1. Take the bananas and mash them with a fork in a large bowl. It's great fun – just like squishing in the sand!
2. Now, add the natural yoghurt, eggs, cooking oil and sugar. Stir everything together well, using a whisk or hand mixer, until the mixture is smooth.
3. In a second bowl, mix the flour, half the cocoa powder, baking powder, and baking soda. Slowly sift this mixture into the banana mixture. Sifting the mixture makes the dough nice and fluffy!
4. Finally, add the salt and cinnamon. Stir briefly.