01 - In a medium bowl, beat the peanut butter, powdered sugar, and vanilla extract together until smooth and well combined.
02 - Gently fold in the Cool Whip until no streaks remain, taking care not to deflate the mixture.
03 - Spoon the mousse into serving dishes or glasses.
04 - Refrigerate for at least 1 hour to chill and set the mousse.
05 - Before serving, top with chopped peanuts and mini chocolate chips, if desired.