Preheat the oven to 170°C (338°F).
Crack the eggs into a bowl and beat them.
Add olive oil and plain Greek yogurt, then mix well.
Add sweetener and vanilla extract and stir thoroughly.
Sift in cocoa powder, cake flour, and baking powder, then combine.
Pour the well-mixed batter into a cake mold.
Bake in the preheated oven for 30 minutes.
After cooling, decorate with chocolate ganache or nuts as desired.