01 - In a medium 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 evenly combined.
02 - Gently fold the fresh or frozen blueberries into the oat mixture, distributing them evenly throughout.
03 - Seal the bowl or jar tightly with a lid and place in the refrigerator for at least 6 hours, preferably overnight, to allow the oats to absorb the liquid and soften.
04 - In the morning, give the oats a good stir. If the mixture is too thick, add a splash of milk until you reach your preferred consistency.
05 - Top with chopped nuts, additional blueberries, and extra lemon zest as desired. Serve chilled.