Puppy Chow

9 C Chex cereal
1 pkg. (6oz.) semisweet chocolate chips
½ C peanut butter
¼ C margarine or butter
1 tsp. vanilla
1 ½ C powdered sugar

Measure cereal into large bowl; set aside. Microwave chocolate chips, peanut butter and margarine in 1 qt. microwaveable bowl uncovered on HIGH for 1 minute. Stir. Microwave 30 seconds longer or until mixture can be stirred smooth. Stir in vanilla. Pour chocolate mixture over cereal in bowl, stirring until evenly coated. Pour into large plastic food storage bag; add powdered sugar. Seal bag, shake until coated.