Pre-heat your oven to 180° and line your muffin tray with cases
Blend together your bananas, oats, eggs, milk, honey/maple syrup, baking soda, vanilla and cacao powder. Alternatively, if you don't have a blender, simply mix the ingredients together in a large bowl
Once your ingredients are combined, stir in your blueberries and dark chocolate chips. I never measure fillings - I just chuck a hearty amount in!
Spoon your batter into your muffin cases. Bake for around 12 minutes or until a skewer inserted comes out clean
Wait to cool, then enjoy!