Preheat the oven to gas 5 / 190C / 375F and line & grease a 9 inch square tin
Simply dump all the ingredients into a large bowl and mix together. No need to separate the wet from the dry, just throw them all in
The mixture should be thick like a banana bread
Spread the batter out in the tin
Bake for 25 - 30 minutes until a toothpick inserted in the middle pulls out clean and the sides of the cake are pulling away from the tin
Let the cake cool in the tin before turning out
Beat the icing ingredients together an add just enough milk to thin down to a spreading consistency
When the cake is completely cooled, spread with the icing and sprinkle lightly with cinnamon
Cut into squares to serve
