01 - In a medium bowl or jar with a lid, combine the rolled oats, milk, Greek yogurt, chia seeds, maple syrup, lemon zest, lemon juice, and vanilla extract. Stir until thoroughly combined and no dry pockets remain.
02 - Gently fold the blueberries into the oat mixture, distributing them evenly throughout. Frozen blueberries can be added directly without thawing.
03 - Cover the bowl or jar tightly and refrigerate for at least 6 hours or overnight to allow the oats to absorb the liquid and soften completely.
04 - In the morning, stir the oats well. If the mixture is too thick, add a splash of milk and stir until you reach your preferred consistency.
05 - Top with chopped nuts, additional blueberries, and extra lemon zest as desired. Serve chilled directly from the refrigerator.