Chocolate Swirl Banana Cake Dec 31, 1999 INGREDIENTS:2 ½ cups all purpose flour 1 tsp. baking soda 1 ¼ cup firmly packed brown sugar ¼ cup butter ½ cup sour cream 1 ½ cup mashed banana 1 large egg 1 tsp. vanilla extract ¾ cup finely chopped semisweet...