In a mixing bowl, add rolled oats, milk, Greek yogurt, maple syrup, cinnamon, and vanilla extract. Mix thoroughly using a whisk until all components are combined.

Continue stirring the mixture until it reaches a uniform consistency without clumps.

Divide the mixture evenly among 2 to 4 airtight jars, leaving space at the top.

Seal each jar tightly and refrigerate for at least 4 hours or overnight.

Before eating, stir each jar. Add a splash of milk if the mixture is too thick.

Top with your choice of chopped nuts, sliced banana, fresh berries, or additional maple syrup.