Sour Cream Banana Bread

1 c. margarine/butter
2 c. sugar
4 eggs
6-8 larged mashed riped bananas
4 c. flour
2 t. baking soda
1/4 t. salt
1/2 c. sour cream
1/2 c. chopped walnuts/pecans (optional)

Beat butter, sugar and eggs in large bowl for 3 minutes/ until light and fluffy. Add bananas, flour, soda, salt and sour cream. Stir until smooth. Pour into greased loaf pans. Bake @ 375 for about one hour (Check large loaves @ 45 minutes and add foil to the top/ small loaves @ 30 minutes, which usually take 45 minutes to bake).