In a big bowl mash, the bananas with a fork, add the melted butter, sugar, warm milk, egg, vanilla extract and mix very well.
In a few butchers add the dry ingredients and mix together. (Don’t over mix the dough).
Add half of the walnuts and mix again.
Fill out the cupcake cups 3/4 of the way up, garnish with the rest of the walnuts and bake at 350 degrees for 25-30 minutes or until toothpick inserted into center comes out clean.