Add the rolled oats, almond milk, Greek yogurt, blueberries, chia seeds, maple syrup, and vanilla extract to a bowl or mason jar.
Stir thoroughly until all ingredients are well combined.
Cover the container with a lid or plastic wrap.
Place in the refrigerator overnight or for at least 6 hours.
In the morning, remove the container and stir the mixture well.
The oats will have absorbed much of the liquid. If desired, add a splash of almond milk to reach your preferred consistency.
Top with additional fresh blueberries or your favorite toppings.
Serve and enjoy your creamy Blueberry Overnight Oats.