Choose a container with a tight seal, like a mason jar or glass container.
Add all dry ingredients (oats, protein powder, chia seeds, cinnamon, salt) to the container. Stir to combine.
Pour in the milk and vanilla extract. Stir well to ensure there are no dry pockets, especially at the bottom.
Seal the container and refrigerate for 6-8 hours or overnight.
The next morning, stir again. Add extra milk if too thick or more oats if too thin.
Top with your favorite toppings such as fresh berries, nut butter, or sliced almonds. Enjoy cold or warm by microwaving for 30-60 seconds.