Grease a loaf pan with Pompeian Grapeseed Oil Spray.
In large bowl, whisk together the flour, baking soda, baking powder and salt.
Mix in chopped walnuts; set aside.
In a second bowl, beat together mashed bananas, sugar, brown sugar, oil, egg, vanilla, nutmeg and cinnamon. Gently stir the banana mixture into the flour mixture until just combined.
Prepare the topping by mixing together the brown sugar, flour, and cinnamon. Using your fingers, cut in the butter until the mixture resembles coarse sand.
Fill prepared bread loaf pan with batter. Sprinkle topping over the wet batter.
Bake for 45 minutes or until a tester or knife comes out clean.
Recipe by Views From the Ville at http://viewsfromtheville.com/2013/11/15/banana-nut-bread-recipe/