01 - In a medium mixing bowl or jar, combine 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 evenly throughout.
03 - Cover the bowl tightly with a lid or plastic wrap and refrigerate for at least 6 hours or overnight to allow the oats to soften and absorb the liquid.
04 - In the morning, stir the oats well. If the mixture is too thick, add a splash of milk and stir until the desired consistency is reached.
05 - Top with chopped nuts, additional blueberries, and extra lemon zest as desired. Serve chilled.