1Line an 8-inch square baking pan with waxed paper.
2Spoon peanut butter and cream cheese frosting into a microwave-safe bowl; heat in microwave on high for 30 seconds. Stir mixture and heat again in microwave for 30 seconds; stir again until completely blended.
3Pour mixture into the prepared baking pan. Refrigerate until chilled, about 1 hour.