Preheat the oven to 180°C (356°F).
Mash the bananas with a fork.
In a bowl, mix the mashed bananas, sugar, eggs, milk, and cooking oil.
Sift in cake flour, baking powder, and salt, and gently combine.
Pour the batter into muffin molds.
Bake at 180°C (356°F) for 20–25 minutes.