In small microwavable bowl, microwave chocolate fudge sauce uncovered on High 10 to 30 seconds or until thin enough to drizzle. Drizzle warmed sauce over cake. In another small microwavable bowl, microwave 2 tablespoons peanut butter uncovered on High in 10-second intervals until thin enough to drizzle. Drizzle warm peanut butter over cake. Store any remaining cake loosely covered in refrigerator.