Preheat the oven to 170°C (338°F).
Whisk together eggs, erythritol, and honey until well mixed.
Sift flour and baking powder, then add to the mixture and combine.
Add milk and olive oil, mixing until smooth.
Pour the batter into a Castella mold.
Bake in the oven for 35-40 minutes.
Let it cool, then cut into slices for serving.