Preheat the oven to 180 degrees. Grease and and flour a large loaf tin and set aside.
In a bowl, beat the butter and sugar till light and fluffy.
Add the eggs, bananas, milk and vanilla and beat till combined.
Sift in the dry ingredients into the wet ingredients and fold till combined.
Pour into the pan and bake for 50 to 60 minutes, or till a skewer inserted in the center comes out clean.
Keep in tin for five minutes, flip onto a cooling rack and allow to cool completely before slicing and enjoying.