Combine 1/4 tub of Fat Free Cool Whip with 2-3 tsp. unsweetened cocoa powder.
Tastes like chocolate mousse. Only 160 calories for the whole thing.
Yum. Simple as pie.
As an alternative, if you like coffee, omit the chocolate powder and stir in some instant coffee powder. Sprinkle with a half tablespoon of mini sized semi-sweet chocolate chips. Calorie count would be 190.