Best Ever Banana Bread

1/2 C. butter or margarine
1 1/2 C. sugar
3 eggs
1 1/2 C. sour cream
2 tsp. baking soda
1 tsp. vanilla
2 1/2 bananas, mashed
1/2 tsp. salt
2 1/2 C. flour
1/2 C. walnuts, chopped

Cream together butter, sugar and eggs. Mix sour cream and baking soda together in separate bowl; let stand until foamy. Add the rest of the ingredients to the above mixture and mix well. Place into 2 greased and floured 9×5″ bread pans and bake 50 minutes at 350º, or until toothpick inserted comes out clean.