1. Preheat your oven to 180°C (350°F).
2. In an ovenproof dish or loaf tin, mix together the mashed banana, rolled oats, Zen Basil Seeds, salt, cinnamon, baking powder, maple syrup (if using), peanut butter, and milk.
3. Stir in the dark chocolate pieces, reserving a few to sprinkle on top.
4. Transfer the mixture to the oven and bake for 30 minutes, or until golden brown.
5. Allow to cool slightly, then enjoy!