Preheat oven to 350 degrees. In a mixing bowl,
cream butter and sugar. Beat in eggs, sour cream,
vanilla, and bananas. Combine the flour and baking
soda. Add to creamed mixture. Mix well. Pour into
a greased 10x15 pan. Bake for 25mins. Cool before
frosting. While the bars are baking, make the
frosting with the last four ingredients- Cream
butter and cream cheese in a bowl. Gradually add
powdered sugar (thru a sift) and vanilla. Beat
well. Spread over cooled bread. Cut into bars
prior to serving.
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