In a large sealable jar or bowl, add rolled oats, vanilla Greek yogurt, and milk of choice. Sprinkle in cinnamon, brown sugar (or maple syrup), and chia seeds. Stir the mixture well until all ingredients are combined.

Once mixed, ensure the mixture is evenly distributed. Seal the jar tightly or cover with plastic wrap to prevent air exposure. Place the jar in the refrigerator.

Let your sealed jar sit in the refrigerator overnight for 6-8 hours.

In the morning, stir the oats. If too thick, add a splash of milk. Prepare an optional drizzle of maple syrup mixed with a pinch of cinnamon.

Spoon the oats into a bowl or enjoy straight from the jar. Feel free to warm them in the microwave for about 30 seconds and add toppings as desired.