Finely blend chicken breast and banana.
In a bowl, mix almond flour, protein powder, and baking powder.
Add the blended ingredients along with egg and Greek yogurt to make the batter.
Evenly distribute the batter into a donut mold.
Bake in a preheated oven at 180°C for 15 minutes.
After cooling, top with unsweetened peanut butter or yogurt if desired.