Preheat oven to 180°C / 350°F. Grease and flour a muffin tin.
In a large bowl, mix the mashed bananas, coconut oil (or butter), honey, eggs and vanilla extract. Then add the flour, baking soda and cinnamon, and mix to combine. Add the chopped chocolate and combine.
Scoop the batter into the muffin cups, filling each about 2/3 full. Bake for 20-25 minutes until a toothpick inserted in the middle comes out clean.