Banana Cake W/chocolate Fudge Icing

INGREDIENTS:

2 c All-purpose flour
1 ts Baking soda
1 pn Salt
1/2 c Unsalted butter; softened
1 c Granulated sugar
2 lg Eggs
1 c Mashed; ripe banana (about 3
-bananas)
1/4 c Sour cream
1 ts Pure vanilla extract
1/2 c Chopped pecans