Preheat oven to 375 degrees. Spray a 9x5x2 1/2 inch loaf pan with cooking spray. In small bowl, combine topping ingredients. Set aside. In large bowl, whisk together flours, remaining sugar, baking powder and salt to combine. In another small bowl, mash bananas. Mix in eggs, buttermilk and oil. Stir wet ingredients into dry ones, mixing just until combined. Pour batter into prepared pan. Sprinkle topping evenly over batter. Bake until knife inserted into center of bread comes out clean, 45 to 50 minutes. Let loaf rest in pan 10 minutes. Turn out onto baking rack and cool completely. Serve or wrap in foil and use later.

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