Preheat the oven to 370℉/180℃. Line a 2lb loaf tin.
In a large bowl, mash the bananas. Then add the butter, both sugars and the egg (ensure the butter has cooled a little so the egg doesn’t cook). Mix with a wooden spoon until combined.
Add the dry ingredients: flour, baking powder, baking soda and ground ginger. Stir until just combined. Pour into the tin.
Mix together the brown sugar and ground ginger and sprinkle over the batter.
Bake for 40-45 minutes, until a skewer inserted comes out clean. Let cool before making the glaze.
Combine the icing sugar and maple syrup until the consistency is runny (if needed, add a little milk). Drizzle over the banana bread. Slice and serve!