01 - In a medium bowl or jar, combine oats, milk, yogurt, cocoa powder, chia seeds, maple syrup, peanut butter, and vanilla extract. Stir thoroughly until well mixed and peanut butter is evenly incorporated.
02 - Cover the container and refrigerate overnight, or for at least 6-8 hours. This allows the oats and chia seeds to soften and the mixture to thicken properly.
03 - In the morning, stir the oats again. If the mixture is too thick, add a splash of milk to reach your desired consistency.
04 - Top with chocolate chips, chopped peanuts, and fresh fruit if desired. Serve chilled.