01 - In a medium bowl or a mason jar, thoroughly mix rolled oats with whole milk until fully incorporated.
02 - Stir in the creamy peanut butter, ensuring it is evenly distributed throughout the mixture.
03 - Fold in sliced banana gently, reserving a few slices for topping if desired.
04 - Cover and refrigerate the mixture for a minimum of 6 hours or overnight to allow the oats to absorb the liquid.
05 - In the morning, stir the oats and top with reserved banana slices before serving chilled.