1/2 c. butter
2 c. sugar
1 c. mashed bananas
1 c. sour milk
2 eggs
2 c. flour
1 tsp. baking soda
1 tsp. baking powder

Dump butter, sugar, eggs, and bananas in a bowl. Mix. Dump in the rest of the ingredients. Mix well. Pour into greased jelly roll pan (10 x 15 inch). Sprinkle top with chopped walnuts. Bake at 350 degrees for 35 minutes.