In large bowl, measure Chex cereal; set aside.
In 1-quart microwavable bowl, microwave chocolate chips, peanut butter and butter uncovered on high 1 minute to 1 minute 30 seconds, stirring every 30 seconds, until smooth.
Stir in vanilla until well mixed. Then pour chocolate mixture over Chex™ cereal in large bowl; stir until well coated.
Pour into 2-gallon resealable food-storage plastic bag; add powdered sugar. Then seal bag; shake until well coated.
Add remaining ingredients. Seal bag; shake until well mixed. Then store in airtight container in refrigerator.