Preheat the oven to 180°C (356°F).
In a medium bowl, mash the bananas until they are smooth with only a few lumps remaining.
Whisk in the egg, yogurt, vanilla extract, and stevia until everything is well combined.
Add the self-raising flour, baking powder, and ground cinnamon, mixing until the batter is smooth and well incorporated.
Gently fold in the chocolate chips.
Transfer the batter to a lined loaf tin.
Bake for 45 to 55 minutes, or until a knife inserted into the center comes out with just a few crumbs.
Let the banana bread cool in the loaf tin for 10 minutes before removing it.
Serve warm and enjoy!
