Cut the banana in half. Mash that in a mixing bowl.
Add the oats, chia seeds, cacao powder, syrup, milk and 2 tablespoons of walnuts into the container as well. Stir everything together then divide between two containers and place in the fridge. Let sit for at least 4 hours or overnight.
When ready to serve, top your serving with 1 tablespoon of coconut yogurt, 1 tablespoon of chopped walnuts and 1/2 of the rest of the banana (sliced!). Enjoy!