01 - Combine the peanut butter and cream cheese in a large mixing bowl. Beat with an electric mixer until smooth and creamy, ensuring no lumps remain.
02 - Add the powdered sugar to the mixture and mix until fully incorporated and smooth. The mixture should be thick and spreadable.
03 - Gently fold in the thawed Cool Whip using a spatula. Mix just until combined and airy, taking care not to overmix or deflate the mixture.
04 - Divide the mousse evenly among 6 serving glasses or bowls, using a spoon to create smooth, even layers.
05 - Refrigerate the mousse for at least 1 hour to allow it to set and develop the proper texture. This step is essential for the best results.
06 - Just before serving, top with chopped roasted peanuts and chocolate shavings or mini chocolate chips if desired.