In a medium bowl, beat together the peanut butter and coconut sugar using an electric hand mixer until well combined. *
Add 1 Tbsp of Greek yogurt to the mixture and beat until well combined and the mixture starts to come together like dough. Stir in the chocolate chips.
Divide the cookie dough between two cups, pressing down into the bottom. Spread 1/4 cup of Greek yogurt on top of each cookie dough layer.
In a medium bowl stir together the oats and cinnamon. Pour in the milk and stir until the oats are evenly soaked. Divide the oats between the two cups and place into the refrigerator overnight.
In the morning, sprinkle with additional chocolate chips, if desired, and DEVOUR.
*Because this is a very small amount, you just need to keep scraping the dough off the sides of the bowl until it's evenly mixed and comes together. I tried to just stir it all together, and it just doesn't get that "cookie dough" texture.