01 - Combine peanut butter and cream cheese in a large mixing bowl. Beat with electric mixer until smooth and creamy.
02 - Add powdered sugar and mix until fully incorporated and smooth.
03 - Gently fold in Cool Whip using spatula, mixing just until combined and airy. Do not overmix to maintain light texture.
04 - Distribute mousse evenly into serving glasses or bowls.
05 - Refrigerate at least 1 hour before serving for optimal texture.
06 - Top with chopped peanuts and chocolate shavings if desired before serving.