Split cereal in half and put 4.5 cups in one bowl and 4.5 cups in another bowl. Set aside.
In a pan, heat white chocolate chips, ¼ cup peanut butter, and ¼ cup butter or margarine. Stir frequently until melted. Add ½ tsp. vanilla.
Remove from heat and pour over one of the bowls of cereal until evenly coated. Pour into a gallon bag with ¾ cup powdered sugar. Seal bag and shake until well coated.
Repeat Steps 2 & 3 for the chocolate Chex.
Pour white chocolate and milk chocolate Chex into one bowl. Add candy corns and mix well. Store in airtight containers.