Scribbled Underline

– 3/4 C. butter softened – 2 teaspoons vanilla – 2 Cup brown sugar – 3 eggs beaten – 1/3 Cup light sour cream – 3 Cup flour – pinch salt – 1.5 teaspoons baking soda – 4 bananas brown (very ripe) bananas, mashed – 1 Cup chopped walnuts or other nuts