Preheat the oven to 180°C.
Add oats to a blender and pulse into a course flour like consistency.
In a large bowl, combine the blended oats, chia seeds, cocoa powder, baking powder and salt.
Then add mashed banana, maple syrup, vanilla, milk and water and mix until well combined.
Pour into a lined loaf tin or baking dish.
Sprinkle over walnuts on top and bake for 25-30 minutes, until just set.
Let cool for 10 minutes before cutting into pieces.
Store in the fridge in an airtight container for up to 5 days or freeze.
When ready to eat slightly heat in the microwave and top with Greek yoghurt and a teaspoon of nut butter.
