Preheat the oven to 180°C (356°F).
Finely chop the chicken breast and set aside.
In a bowl, mix together eggs, unsweetened cocoa powder, erythritol, baking powder, almond flour, and the chopped chicken breast until well combined.
Spread the batter evenly in a baking pan.
Bake in the oven at 180°C (356°F) for 20 minutes.
Let it cool completely and then cut into serving pieces.