Mash the banana and prepare it.
Mix black sesame powder, flour, baking powder, and salt in a bowl.
In a separate bowl, combine the mashed banana, sugar, eggs, milk, and cooking oil and mix well.
Combine the two mixtures and mix thoroughly.
Pour the batter into a loaf pan lined with parchment paper.
Bake in a preheated oven at 180°C for 40 to 45 minutes.
Cool, then slice and serve.