Preheat the oven at 150 celsius or 300 Fahrenheit on fan mode
Add the soy milk to the blender
Place the remaining ingredients except from the nut butter
Blend until smooth, it has to make a very thick batter
Place the batter in a small baking tray
Make it smooth using a silicon spatula
Use a chopstick to get the butter into the mix, and make some waves until you make a nice pattern
Put the tray into the oven for about 38 minutes
Let it rest for about 20, or even wait and put it in the fridge before cutting it (hardest part!)
Enjoy!