Boil the sweet potatoes, peel them, and mash them.
Add almond flour, cocoa powder, and baking powder to the mashed sweet potatoes and mix well.
Add coconut oil, unsweetened soy milk, and stevia to make the batter.
Spread the batter evenly into a rectangular pan.
Bake in a preheated oven at 180°C (356°F) for 25 minutes.
Let the brownies cool and cut them into pieces for serving.