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