Melt dark chocolate and coconut oil together over a double boiler.
Add eggs and erythritol to a bowl and mix well.
Add almond flour, cocoa powder, and salt, then mix.
Pour in the melted chocolate mixture and stir until the batter is well combined.
Pour the batter into a pan lined with parchment paper and spread it evenly.
Bake in a preheated oven at 180°C (356°F) for 20 minutes.
Let it cool and cut into bite-sized pieces.