In a mason jar, combine rolled oats, milk, Greek yogurt, chia seeds, cinnamon, vanilla extract, and maple syrup. Stir well until fully blended.

In a separate bowl, mix almond butter, cinnamon, and maple syrup until smooth to create the cinnamon swirl.

Spoon half of the oat mixture into the jar, drizzle half of the cinnamon swirl, then layer with remaining oats and swirl again.

Seal the jar and place it in the refrigerator to chill overnight or for at least 4 hours.

In the morning, stir the mixture and optionally drizzle with icing and sprinkle cinnamon before serving.