Preheat your oven to 180 degrees celsius
Cream the butter, brown sugar and vanilla
Add the eggs and beat
Stir through the mashed bananas (I do this on low speed with my stand mixer)
Heat the milk until piping hot, I do this in the microwave approx 20 seconds. Stir the baking soda into the milk, it will foam and increase in volume as the baking soda activates.
Add the baking soda and milk to the cake batter, stir through. (I do this on low speed with my stand mixer)
Add flour, baking powder and cinnamon to the cake batter and stir through, I use a wooden spoon for this step.
Pour the banana cake batter into a lined cake tin. I like to use a large rectangular tin (it means I can cut squares of cake that will easily fit in my kids lunchboxes.)
Bake at 180 degrees celsisus for 35 minutes or until a skewer come out clean when pierced into the morning of the cake.