In a small bowl, stir together the protein powder, coconut sugar and cinnamon. Slowly add in the water, adding enough until it makes a thick but still spreadable, mixture. Then, spread 2/3 of the mixture into the bottom of a cup or small bowl.
In a separate small bowl, whisk together the oatmeal, milk and Greek yogurt until well mixed. Spoon over top of the cinnamon mixture.
Spread, or drizzle all of the remaining cinnamon mixture on top of the oats and refrigerate for at least 6 hours - overnight. (You can also put all the cinnamon mixture on the bottom if you want to make this even easier!)
In the morning, swirl it all up so you get cinnamon in every bite, and DEVOUR.