Preheat oven to 350. Spray bottom only of 9x5x3 loaf pan with nonstick spray. Beat butter in lg bowl with mixer set on med until light and fluffy. Add granulated sugar and brown sugar; beat well. Add egg, egg whites and vanilla; beat until well blended. Add mashed bananas, and beat on high speed 30 secs. Combine flour baking soda, salt and baking powder in a medium bowl. Add flour mixture to butter mixture alternatively with cream, ending with flour mixture. Add walnuts to batter mix well. Pour batter evenly into prepared loaf pan. Bake until browned and toothpick inserted near center comes out clean, about 1 hr 15 mins. Cool bread in pan on wire rack 10 mins. Remove bread from pan; cool completely on wire rack. Slice and serve.
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