* Force bananas through potato ricer before measuring. Grease two 9" cakes pans, then dust lightly with flour. Sift flour once, then measure and sift again with soda and baking powder. Cream butter, add sugar and cream together until light and fluffy. Add the whole eggs, beating well after each addition of each. Add buttermilk and vanilla to bananas. Add, alternately, the flour and banana mixture to butter mixture, beginning and ending with the dry ingredients. Beat until smooth and well blended. Do not overmix. Divide, evenly, into cake pans. Bake in preheated 375 degree oven for 25 to 30 minutes.