Preheat your oven to 400℉. Make sure you grease or spray your muffin tray with oil or use muffin liners and spray the inside of the liners with oil. These tend to stick otherwise.
To a blender or food processor, add all of the ingredients EXCEPT THE CHOCOLATE CHIPS, and pulse until mostly smooth. Next, stir in the chocolate chips with a spoon. Transfer the batter to your muffin tray and optionally top with some more chips. Bake for 15-20 minutes or until tops are just starting to turn golden - do not over bake. Allow to cool in the pan for 10 minutes and then remove to cooling rack.
Notes
The chocolate chips are optional - you can add in walnuts, raisins etc. instead.This recipe is adapted from RunningWithSpoons.com