Preheat oven to 365°F (180°C). Coat a 6-count muffin pan with nonstick spray or line with cupcake liners. Set aside.
In a large bowl, mash bananas with a fork.
Add an egg and mix.
Add Kokuto through a mesh strainer, and also add melted butter, then mix.
Add almond flour, baking powder, salt and 3 tablespoons of water. Then well combined.
Add sifted white flour and gently mix until just about combined.
Spoon the batter into muffin pan, and top with chocolate and nuts.
Bake the muffins for 25 minutes.
Notes
Disclaimer: Kokuto (Okinawa black sugar) can contain the bacteria that causes infant botulism, so do not feed Kokuto (Okinawa black sugar) and this muffins to children younger than 12 months.