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Preheat oven to 350. Spray bottom only of 9 x 5 x 3-inch loaf pan with nonstick cooking spray.
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Beat butter in large bowl with electric mixer set at medium speed until light and fluffy.
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Add granulated sugar and brown sugar, beat well.
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Add egg, egg whites and vanilla,beat well until blended.
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Add mashed banana, and beat on high speed 30 seconds.
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Combine flour, baking soda, salt and baking powder in medium bowl.
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Add flour mixture to butter mixture alternately with cream, ending with flour mixture.
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Add walnuts to batter, mix well.
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Pour batter evenly into prepared loaf pan.
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Bake until browned and toothpick inserted near center comes out clean, about 1 hour and 15 minutes.
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Cool bread in pan on wire rack 10 minutes.
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Remove bread from pan; cool completely on wire rack.
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Slice and serve with butter or jam.