Preheat the oven to 170°C (338°F).
Combine almond flour, unsweetened cocoa powder, and baking powder in a bowl.
In another bowl, whisk together eggs, Greek yogurt, erythritol, and vanilla extract.
Add the dry ingredients to the egg mixture and mix until well combined.
Pour the batter into a baking pan.
Bake in the oven for 20–25 minutes.
Let it cool, then cut into pieces to serve.