Preheat the oven to 180 degrees C. Grease a 9 x 5 inch loaf pan and line the bottom of the pan with parchment paper.
Mix Sugar and Olive Oil in a mixing bowl and whisk until sugar dissolves. Add egg one by one and cream until light and fluffy.
Add the 3 mashed banana and milk and stir to combine. Keep side.
In a separate bowl sift all dry ingredients together and add to the wet ingredients and stir everything until combined.
Now pour the batter into the prepared loaf pan, tap gently to break bubbles . Slit a banana into half length wise and place on top of the batter and bake for 60 minutes, or until a toothpick inserted in the center comes out clean.
Set aside to cool on a wire rack for a few minutes before removing the bread from the pan and allowing it to cool completely.