Preheat oven to 180 °C. Lightly grease a 1,5 litre bread tin.
Beat the oil, sugar, eggs and vanilla and stir in bananas.
Dissolve bicarb in milk and stir into the egg mixture.
Place the dry ingredients in a large mixing bowl and stir in the egg mixture.
Spoon batter into the bread tin and bake for about 40 minutes or until a skewer comes out clean. Allow to cool on a cooling rack.
Add 1 tsp ground nutmeg and 1 tbsp ground cinnamon or mixed spice to the batter.