1/2 c. butter, softened
1 c. sugar
2 eggs
1 tsp. vanilla
1 c. mashed banana, about 2-3
1/2 c. chopped nuts
1/2 c. sour cream or plain yogurt
1 1/2 c. flour
1 tsp. baking soda
1/2 tsp. salt

Combine ingredients in order listed, mixing after each addition. Beat 1 minute. Bake in greased loaf pan at 350 degrees for 1 hour.