Muddy Buddies

I know everyone knows how to make these, but I made them with Laryssa and she had so much fun!

9	cups Corn Chex®, Rice Chex®, Wheat Chex® or Chocolate Chex® cereal (or combination) (I do not suggest the wheat chex!)
1	cup semisweet chocolate chips
1/2	cup peanut butter
1/4	cup butter or margarine
1	teaspoon vanilla
1 1/2	cups powdered sugar 1Into large bowl, measure cereal; set aside. 2In 1-quart microwavable bowl, microwave chocolate chips, peanut butter and butter uncovered on High 1 minute; stir. Microwave about 30 seconds longer or until mixture can be stirred smooth. Stir in vanilla. Pour mixture over cereal, stirring until evenly coated. Pour into 2-gallon resealable food-storage plastic bag. 3Add powdered sugar. Seal bag; shake until well coated. Spread on waxed paper to cool. Store in airtight container in refrigerator.