In a large bowl, add one container of fat free Cool Whip and 2 tablespoons of PB2 powder.
Divide the mixture equally into seven cupcake liners.
If desired, add a swirl of calorie free chocolate syrup.
Freeze the Weight Watchers peanut butter cups for 4-5 hours, until they have hardened.
Enjoy right out of the freezer or let thaw for a few minutes.