banana bars

1/2 cup butter
11/2 cups sugar
2 eggs
1 cup mashed bananas
2 1/4 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1 cup sour milk (1 cup milk + 1 teaspoon vinegar)

Icing
1/2 cup butter
1 cup brown sugar
1/4 cup milk
2 cups sifted powdered sugar
1/2 teaspoon vanilla

1. Combine ingredients and bake in 9x13 pan at 350 degree oven for 20 minutes.
2. For icing