Add the rolled oats and then the low-fat milk into a container that you will later place into the fridge overnight.
Add 1 sliced banana, followed by the greek yogurt, honey, vanilla extract, cinnamon, and ground nutmeg.
Top it off with the chopped walnuts and some more sliced banana.
Seal the container or cover with saran wrap and place into the refrigerator overnight, or for at least 4-5 hours, for all the oats to absorb the tasty liquids and flavors. The longer the better since we really want those flavors to meld together and those oats to absorb all the liquid.
When ready to eat, remove from the refrigerator, stir well and enjoy. You can enjoy this cold right out of the fridge, or you can heat it up in the microwave for approximately 2 minutes and enjoy hot.