Chop the dark chocolate into small pieces.
In a bowl, mix the eggs, Greek yogurt, cocoa powder, and erythritol.
Melt the chopped dark chocolate using a double boiler or microwave.
Add the melted chocolate to the bowl and mix evenly.
Pour the batter into an oven-safe container and bake in a preheated oven at 180°C (356°F) for 15-20 minutes.
Let it cool before serving.