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 to the peanut butter mixture. Mix until fully incorporated and no lumps remain.
03 - Gently fold in the Cool Whip with a spatula, mixing just until combined and airy. Take care not to overmix to maintain the light texture.
04 - Divide the mousse evenly into serving glasses or bowls, smoothing the tops with a spatula if desired.
05 - Refrigerate for at least 1 hour before serving to allow the mousse to set and achieve the best texture.
06 - Sprinkle chopped roasted peanuts and chocolate shavings or mini chocolate chips on top just before serving, if desired.