Put almond flour and coconut flour in a bowl and mix well.
Add erythritol, baking powder, salt, and cocoa powder.
Add egg, coconut oil, and vanilla extract, then knead into a dough.
Chop sugar-free dark chocolate finely and mix into the dough.
Shape the dough into scones and place them on a baking pan.
Bake in a 180°C oven for 15–18 minutes.
Let cool before serving.