1/2 cup butter, room temperature
1 cup sugar
1 1/2 cups flour
1 tsp baking soda
1/2 tsp salt
1 cup mashed very ripe bananas
1/2 cup sour cream
1 tsp vanilla
1/2 cup chopped walnuts or pecans (optional)
Preheat over to 350 degrees. Put butter (or use Pam spray) on a loaf or muffin pan or 9x13 pan. With an electric mixer, cream butter and sugar until light and fluffy. Add eggs, then add bananas, sour cream and vanilla and mix well. Add flour, baking soda and salt and mix. Stir in nuts as desired. Pour into prepared pan.
Bake at 325 degrees. Baking time will vary depending on size of pan used. Just keep an eye on it and pull out when it is looks cooked.