Step 1: In a glass jar or airtight container, combine the rolled oats, ground cinnamon, and a pinch of sea salt. Stir well to ensure the spices are evenly distributed.
Step 2: Add the milk, Greek yogurt, vanilla extract, and maple syrup to the jar. Stir until the mixture is well combined and no dry pockets of oats remain.
Step 3: If using the cinnamon swirl topping, mix the almond butter and extra cinnamon in a small bowl, then drizzle it over the oats and swirl with a knife.
Step 4: Secure the lid on the container and place it in the refrigerator for at least 6 hours, or ideally overnight, to allow the oats to soften and absorb the flavors.
Step 5: In the morning, stir the oats once more. If they are too thick, add a splash of milk. Top with nuts or extra yogurt if desired and enjoy.