Preheat the oven to 350.
Line a 12 count muffin tin with liners.
In a large bowl, cream together the butter and sugars.
Add bananas to the butter and sugar, mix well.
Add the eggs, milk and vanilla extract. Mix well.
Add the dry ingredients- flour, baking powder & soda, cinnamon and allspice to the batter. Mix until the flour is well combined. Batter will be lumpy from bananas.
Coat walnuts in a small amount of flour to help them from sinking to the bottom of the muffins. Stir into batter.
Spoon until liners and bake 17-20 minutes until done. To check for doneness, stick a toothpick or butter knife into the middle. If it comes out clean, they're done.
Remove from heat, allow to cool and dig in!