Chop the dark chocolate into small pieces.
In a bowl, combine cocoa powder and almond flour.
Add eggs, erythritol, and almond milk, then mix well.
Add the melted dark chocolate to the batter and mix thoroughly.
Pour the batter into a pan and spread evenly.
Bake in a preheated oven at 180°C for 15 minutes.
Let it cool, then cut into bite-sized pieces.