Steps
1. Preheat oven to 350°F (175°C) and lightly grease a small ramekin or cake tin.
2. In a bowl, mash the banana well with a fork and add lemon juice.
3. Add the egg white, Greek yogurt, and vanilla extract to the banana and mix until combined.
4. In a separate bowl, whisk almond flour, baking powder, and cinnamon.
5. Fold the dry ingredients into the wet mixture gently.
6. Gently fold in the fresh blueberries.
7. Pour the batter into the prepared ramekin.
8. Bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.
9. Let cool for 10 minutes before serving.