Banana Bread (Mom)

5 Tbsp butter (room temperature)
1/2 c. sugar
1/2 c. firmly packed light brown sugar
1 large egg
2 egg whites
1 tsp vanilla extract
1 1/2 c. mashed, very ripe bananas (3 bananas)
1 3/4 c. all-purpose flour
1 tsp baking soda
1/2 tsp salt
1/4 tsp baking powder
1/2 c. heavy cream
1/3 c. chopped walnuts (optional)

Preheat oven to 350F. Spray bottom of loaf pan with nonstick cooking spray.

Beat butter in large bowl with electric mixer set a medium speed until light and fluffy. Add sugar and brown sugar;  beat well. Add egg, egg whites and vanilla; beat until well blended. Add mashed banana, and beat on high speed 30 seconds.

Combine flour, baking soda, salt and baking powder in medium bowl. Add flour mixture to butter mixture alternately 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 hour and 15 minutes.

Cool bread in pan on wire rack 10 minutes.