Grease your bread loaf tin a 4x8 inch or 10 x 20cm
In a large bowl using an electronic mixer mix the butter and the mashed bananas.
Mix in the sugar, egg and vanilla.
Add the baking soda and salt and mix it into the batter
Add the flour and coconut and beat, do not over beat the batter. Using a spatula gently fold in blueberries. Be carseful to not break them as you will get a blue banana bread. Top the bread with the sliced banana and sprinkle the top with the sugar. This will result in a perfect crust.
Add your mixture to the baking tin and bake for 1 hour.
Allow cooling on your cooling rack in the tin for 15 minutes and then let it cool further out of the tin.