In a sealable container combine the oats and peanut butter. Add a little bit of the milk if necessary.
Once combined, add the rest of the milk and cinnamon and mix well. Seal and refrigerate overnight.
In a small pot combine the mango cubes and maple syrup and cook on medium heat for 5 minutes.
Refrigerate in an airtight container.
Top the oats with macadamia nuts to serve.