01 - Combine the peanut butter and softened cream cheese in a large mixing bowl. Beat with an electric mixer until completely smooth and creamy, ensuring no lumps remain.
02 - Add the powdered sugar to the peanut butter mixture and mix on medium speed until fully incorporated and the mixture is uniform in texture.
03 - Gently fold in the thawed Cool Whip using a spatula with light, sweeping motions. Mix just until combined and the mixture becomes airy—avoid overmixing to maintain the light texture.
04 - Divide the mousse evenly among 6 serving glasses or bowls, smoothing the tops with the back of a spoon for a neat presentation.
05 - Refrigerate the portioned mousse for at least 1 hour to allow it to set and develop the proper creamy consistency before serving.
06 - Just before serving, sprinkle the tops with chopped roasted peanuts and chocolate shavings or mini chocolate chips if desired.