Soften butter. Add mashed bananas and sugar and mix together. Beat in eggs. Add salt, baking powder and soda. Mix. Add sour cream & mix again. Last, mix in the flour. Stir in nuts if desired. Pour into 2 greased (and I use parchment paper or foil in the bottom) loaf pans. Sprinkle top of batter with sugar before baking.
Makes 2 loaves or 1 giant bundt.
Loaf pans: Bake 340 degrees for 50 minutes (or until a knife comes out clean).
Bundt pan: Bake 340 degrees for 1 hour 10 minutes (or until a knife comes out clean).