Blend 100g boiled soybeans, 50g boiled oats, 10g peanut butter, 10g black sesame powder, and a pinch of salt in a blender.
Rinse the soybeans and oats thoroughly and soak for at least 6 hours.
Add the soaked soybeans and oats to a pot and pour in water.
Bring to a boil over high heat, then reduce to medium-low heat when it starts boiling.
Simmer for about 30 minutes until the ingredients are soft.
Blend the ingredients until smooth and return them to the pot.
Season with salt, then simmer over low heat while stirring for a moment longer.
Serve the finished porridge in a bowl.