Place oats, chia seeds and brown sugar in a bowl. Combine with a spoon or whisk until everything is mixed in.
Add in the milk and maple syrup and mix thoroughly.
Pour into 2 glasses or jars (approximately 1 cup/250ml in size).
Place in the fridge covered for 4 or more hours. Ideally overnight.
Top the overnight oats with additional maple syrup if using.
