Preheat the oven to 170°C (340°F).
Add eggs to a bowl and whisk them.
Add erythritol and mix well.
Add Greek yogurt and milk.
Sift in cocoa powder, almond flour, baking powder, and instant coffee.
Mix all the ingredients to make the batter.
Pour the batter into a pound cake mold.
Bake in the oven at 170°C (340°F) for 25-30 minutes.