Preheat oven to 350 degrees. Grease and flour pans. Cream together butter and sugar until light and fluffy. Add eggs, 1 at a time, beating well after each addition. Add bananas, mixing thoroughly. Sift dry ingredients together and add to butter-egg mixture. Add buttermilk. Mix 1 minute. Stir in chopped nuts (optional). Pour into prepared pans and bake for 25-30 minutes or until tester inserted into center comes out clean. Cool in pans on rack for 10 minutes. Unmold and cool on rack for 2 hours. Frost when completely cooled. To make icing, use an electric mixer to mix ingredients until smooth and creamy. Serves 8 to 10.
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