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Preheat oven to 375 degrees F. Lightly grease 9x13 baking dish, muffin pan, or loaf pan and set aside.
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In a mixing bowl, stir together flours, baking soda, baking powder, cinnamon, and salt.
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In a separate bowl, mix together bananas, sugars, butter, and vanilla.
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Combine the wet mix with the dry mix until moistened.
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Pour batter into greased dish.
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In a mixing bowl, combine crumb topping ingredients.
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The mixture will be coarse and chunky. Evenly distribute topping over batter.
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Bake for 15-18 minutes in preheated oven or until a toothpick inserted comes out clean.