Mix almond flour and coconut flour in a bowl.
Add stevia, baking powder, and salt. Mix evenly.
In a separate bowl, whisk eggs, coconut oil, and vanilla extract together, then pour into the dry ingredients and mix until combined.
Chop sugar-free dark chocolate and add it to the dough. Mix well.
Shape the dough into rounds or triangles.
Bake at 180°C (356°F) for 20-25 minutes.
Let cool before serving.