Preheat the oven to 180°C (356°F).
In a bowl, mix almond flour, cocoa powder, and baking powder.
In another bowl, whisk together eggs, Greek yogurt, and erythritol until well combined.
Combine all the ingredients and mix thoroughly.
Pour the batter into a mold.
Bake in the preheated oven for 25-30 minutes.
Let it cool completely, then cut into your desired size.