Mix soy milk, egg, and erythritol in a bowl.
Add black sesame powder, almond flour, protein powder, baking powder, salt, and coconut oil. Mix well.
Divide the batter into muffin molds or small bread tins.
Bake in a preheated oven at 180°C (356°F) for 20-25 minutes.
Let cool completely before removing from the molds.