Preheat the oven to 180 degrees C. Grease and line a 9x5 inch loaf pan. Set aside. In a large bowl, combine the flour, baking soda, salt, cinnamon and sugars. 

Add in the eggs, vanilla and softened butter and stir (don't worry, it will be lumpy!) then add in the maple syrup and mashed banana and stir until combined. Be careful not to over-mix as this will toughen the batter. 

Pour into the prepared loaf pan and bake for 35-45 minutes or until a knife inserted comes out clean. If the top is getting too brown, cover with foil and place back in the oven. Leave to cool for 15 minutes and then remove from the pan. Cover in foil and store for up to 1 week.