Ingredients: 5 tablespoons butter, softened 1 cup organic sugar 1 large egg 2 egg whites 1 teaspoon vanilla extract 2 very ripe bananas, mashed 1 3/4 cups flour 1 teaspoon baking soda 1/2 teaspoon salt 1/4 teaspoon baking powder 1/3 cup walnuts Directions: Preheat oven to 350 degrees Fahrenheit. Grease bottom and sides of a…