Combine the rolled oats, almond milk, Greek yogurt, chia seeds, cinnamon, maple syrup, vanilla extract, and sea salt in a 12-ounce mason jar or airtight container.

Stir or shake the mixture vigorously until all ingredients are fully incorporated and the chia seeds are evenly distributed.

Seal the container with a tight-fitting lid to prevent oxidation and odor absorption.

Place the container in the refrigerator and allow the oats to hydrate for a minimum of 6 hours, ideally overnight for 8 hours.

Stir the oats once more before serving to ensure a creamy consistency; if the mixture is too thick, add an additional tablespoon of milk.