Preheat oven to 350°. In a large bowl, combine first six ingredients. In a large bowl, whisk eggs, bananas, oil and vanilla. Stir into dry ingredients just until moistened. Stir in nuts if desired. , Transfer to two greased 8x4-in. loaf pans. Bake 55-65 minutes or until a toothpick inserted in center comes out clean. Cool 10 minutes before removing from pans to wire racks.