In a mixing bowl, combine rolled oats, chia seeds, matcha powder, cinnamon, and a pinch of salt. Whisk these dry ingredients together until they are evenly blended.

Next, add plain Greek yogurt, unsweetened milk, vanilla extract, and maple syrup or honey to the bowl. Using a spatula, stir the mixture vigorously until well combined.

Once fully mixed, carefully spoon the mixture into jars or airtight containers, filling them about three-quarters full. Close the lids securely.

Place the filled jars in the refrigerator for at least 2 hours or, ideally, overnight to allow the flavors to develop.

When ready to enjoy, remove from the fridge, stir, and top with fruits, nuts, or seeds before serving.