01 - In a medium bowl or jar, combine the oats, milk, Greek yogurt, brown sugar, cinnamon, and vanilla extract. Stir well until fully integrated and no dry pockets remain.
02 - Cover the container tightly and refrigerate for a minimum of 8 hours, allowing the oats to absorb the liquid and soften to a creamy consistency.
03 - In the morning, stir the oats thoroughly. If the mixture appears too thick, add a splash of milk to reach your preferred texture.
04 - Top with banana slices, chopped nuts, and fresh berries if using. Serve cold straight from the refrigerator.