Cream together:
1/4 c butter
1/4 c shortening
1 c sugar

Add:
2 eggs
4 T buttermilk (or sour milk or regular milk with a bit of vinegar added)
3 to 4 large crushed bananas (I always go for 4 - the more banana the better for me)

Sift together and add:
2 c flour
1 t soda
1/2 t salt

1/4 c butter

Bake in a buttered loaf pan at 350* for one hour or until a knife inserted comes out clean