Preheat the oven to 350
Line muffin tin with liners
In a large bowl cream butter and sugar until light and fluffy.
Add bananas and mix into butter/sugar mixture.
Add the eggs, milk and vanilla extract.
It will be lumpy from the bananas which is fine.
Add flour, baking soda, baking powder, cinnamon and all spice to the batter.
Mix until flour is combined.
Coat walnuts in a little flour and stir into batter.
Spoon into prepared liners and bake for 18-20 min or until a tooth pick comes out clean.
Remove from heat and let chill on cooling wrack.