01 - In a medium mixing bowl or mason jar, add the rolled oats, milk, Greek yogurt, chia seeds, maple syrup, lemon zest, lemon juice, and vanilla extract. Stir thoroughly until all ingredients are evenly incorporated.
02 - Gently fold the blueberries into the oat mixture using a spatula or spoon, distributing them throughout without mashing.
03 - Seal the bowl tightly with a lid or plastic wrap and place in the refrigerator for a minimum of 6 hours, preferably overnight, to allow the oats to absorb the liquid and soften.
04 - In the morning, remove from the refrigerator and stir well. If the mixture is too thick, add a splash of milk and stir until the desired consistency is reached. Top with chopped nuts, additional blueberries, and extra lemon zest as desired. Serve chilled.