preheat to 350. sprya bottom of 9x5x3 inch loaf pan with nonstick cooking spray. beat butter in large bowl with electric mixer until light and fluffy. add both sugars beat well. add egg, egg whites, and vanilla, beat until well blended. add mashed bananas and beat on high speed 30 seconds. combine flour, baking soda and powder and salt in medium bowl. add flour mixture to butter mixture alternately with cream, ending with flour mixture, add walnuts and mix well. pour batter evenly into prepared loaf pan. vake until browned and toothpick inserted near center comes out clean. cool bread for 10 mins.
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