In a mixing bowl, combine rolled oats, your choice of milk, Greek yogurt, cinnamon, and vanilla extract. Stir in honey or maple syrup for sweetness, ensuring all ingredients are well combined.

Spoon the mixture evenly into individual jars or airtight containers, filling each jar to about three-quarters full.

Place the jars in the refrigerator to chill for at least 4 hours, preferably overnight.

In the morning, stir each jar well. If too thick, add a splash of milk to achieve desired consistency.

Before serving, add toppings like chopped nuts or yogurt, and enjoy!