Preheat oven to 350 and line a standard 9 x 5.5 x 3 loaf tin with non-stick parchment paper.
Combine all ingredients EXCEPT chocolate chips in a food processor or high-powered blender, in the order listed. Blend until completely smooth and creamy (will take longer to get creamy in the food processor, but blender will require a tamper and some elbow grease!). Unplug whatever equipment you’re using and remove blade, if using FP. And chocolate chips and stir to distribute evenly throughout.
Pour batter into your lined loaf tin and spread in an even layer. Bake for 55 minutes, then place a kitchen towel down on one of the shelves of your fridge, and put loaf pan on top. Refrigerate at least 1 hour before removing from the loaf tin/paper and slicing. Ideally 2 hours!
Bars will keep in the refrigerator up to 5 days.