Combine almond flour, coconut flour, baking powder, and salt in a bowl and mix together.
Add eggs, stevia, vanilla extract, melted coconut oil, and soy milk. Mix well until combined.
Add black cocoa powder and chopped dark chocolate. Knead into a dough.
Divide the dough into even pieces and shape them thickly.
Bake in a preheated oven at 180 degrees Celsius for 18 minutes.
Let cool before serving.