Preheat the oven to 350' and line a muffin tin with muffin liners
In a bowl, add the flour, baking soda, cinnamon, and salt. Use a whisk to combine them together
In a separate bowl, mash the bananas and add the egg and sugar. Whisk well to combine and then add in the coconut oil and vanilla extract. Whisk again.
Fold the dry flour mixture into the wet ingredients using a rubber spatula until combined and then fold in the chocolate chips. Scoop the mixture into the muffin tray (about halfway full), top with a few more chocolate chips and bake for 16-18 minutes or until a toothpick comes out clean