Mash the banana and layer it at the bottom, cover lightly with oatmeal, gently moisten with soy milk, sprinkle allulose on top, then cover with blueberries and bake at 190°C for 40 minutes.
Mash the banana finely.
Add eggs and sugar to a bowl and mix well.
Add the mashed banana, milk, and cooking oil and mix together.
Sift in cake flour, baking powder, and salt, then fold gently.
Pour the batter into the mold.
Bake in a preheated oven at 170°C for 35 minutes.
Cool and serve.