Combine butter,sugar & eggs.
Combine dry ingredients and blend both mixes.
Add mashed bananas, sour cream, vanilla and nuts.
Pour into greased & floured pans.
Sprinkle with sugar.
Bake @ 350 for 1 hour.
Makes 2 reg size loaf pans.
(Can make 4 small loaf pans. Bake at 300 for 50-55 min)