In a medium mixing bowl mix together the oats, chia seeds, protein powder and cinnamon.
Stir through the milk, vanilla extract and maple syrup until well combined.
Cover and refrigerate overnight. Stir the mixture after 2 hours to ensure all oats and chia seeds are evenly absorbing the liquids, and place back in the fridge.
In the morning divide the mixture between 2 bowls or glasses and top with your favorite toppings such as fresh berries, yoghurt, crushed nuts etc.
