Preheat the oven to 170°C (338°F).
In a bowl, combine eggs, protein powder, almond flour, and baking powder.
Add olive oil, non-fat milk, and erythritol to complete the batter.
Line a pound cake mold with parchment paper and pour in the batter.
Bake in the preheated oven at 170°C (338°F) for 30–35 minutes.
Once completely cooled, remove from the mold and slice into pieces.