Preheat the oven to 190oC / 170oC fan / 375oF. Grease an 8 inch square baking tin for later.
Mix the flour, sugar, cinnamon, baking powder, baking soda and salt in a large bowl.
In a separate bowl, mash the bananas until they are lump free. Stir in the fat free natural yogurt, whisked egg, vegetable oil and vanilla paste.
Pour the liquid ingredients into the dry ingredients and mix till combined.
Pour the mixture into your prepared tin and cook in the centre of the oven for 25 - 30 minutes. Once cooked a toothpick inserted into the middle of the cake will come out clean.
Leave to stand for 5 - 10 minutes before removing from the tin and placing on a wire rack to cool. Cut into 12 squares.
Please be aware that the nutritional information below has been automatically generated and does not account for variations in product brands and types, weights of individual ingredients etc. It should therefore be considered as an estimate.PointedKitchen.com has calculated Weight Watchers Smart Points based on the individual ingredients used to make this recipe and not from the following nutritional information.PointedKitchen.com is not responsible for any loss or damage relating to your reliance on this nutritional information.