Cream sour cream, sugar, butter, vanilla and eggs. Add bananas baking soda and flour. Bake in a moderate oven *350 degrees* in a prepared 9x13 pan. Baking time varies. 45 minutes should be way more then enough. Mine takes 40 minutes and five to toss together.
Icing: as cake is baking bring orange juice and butter to room temperature. add powdered sugar in a mixer. Until its at desired consistency.