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.
03 - Gently fold in the Cool Whip with a spatula, mixing just until combined and airy. Do not overmix.
04 - Portion the mousse evenly into serving glasses or bowls.
05 - Refrigerate for at least 1 hour before serving for best texture.
06 - Garnish with chopped peanuts and chocolate shavings if desired.