Preheat the oven to 180°C.
Combine almond flour, cocoa powder, baking powder, and salt in a bowl and mix well.
In another bowl, whisk together eggs, olive oil, erythritol, and vanilla extract.
Add the dry ingredients to the wet ingredients and mix until well combined.
Gently fold in chopped nuts.
Pour the batter into a baking pan lined with parchment paper and spread evenly.
Bake in the oven at 180°C for 20 minutes, then let cool.