Preheat oven 350 degrees.
Grease a long loaf pan.
Cream together butter and sugar.
Add eggs one at a time and stir till well blended.
Add crushed bananas and milk and mix.
Sift together flour, baking powder, baking soda and salt.
Add to creamed mixture and beat till mixed well.
Place in greased loaf pan and allow to rise to 15 minutes.
Bake at 350 degrees for 1 hour or until toothpick inserted in the middle comes out clean.
Serve warm or cold.