01 - Combine the peanut butter and cream cheese in a large mixing bowl. Beat with an electric mixer until smooth and creamy.
02 - Add the powdered sugar and mix until fully incorporated and no lumps remain.
03 - Gently fold in the Cool Whip using a spatula, mixing just until combined and airy. Do not overmix to maintain light texture.
04 - Spoon the mousse evenly into serving glasses or bowls, smoothing the tops as needed.
05 - Refrigerate for at least 1 hour before serving to allow the mousse to set and achieve optimal texture.
06 - Sprinkle with chopped peanuts and chocolate shavings or mini chocolate chips just before serving, if desired.