1. Stir together first 4 ingredients in a large bowl; make a well in center of mixture.
2. Stir together bananas and next 4 ingredients; add to flour mixture, stirring just until dry ingredients are moistened. Gently fold in walnuts.
3. Pour batter into a 9- x 5-inch loaf pan coated with cooking spray.
4. Bake at 350° for 55 minutes to 1 hour or until a wooden pick inserted in center comes out clean. Cool in pan on a wire rack 10 minutes; remove from pan, and cool completely on wire rack. Serve with light whipped cream cheese, if desired.
Note: Nutritional analysis does not include cream cheese.