Ears of corn may be made several days ahead and then stored in an airtight container.
Melt butter in a large saucepan over low heat. Add marshmallows, stirring until melted. Remove from heat; stir in cereal, peanut butter morsels, and candy corn.
Coat 6 (7-inch) pieces of yellow plastic wrap with cooking spray; divide cereal mixture into 6 equal portions. Wrap each portion in plastic wrap, rolling tightly and shaping to resemble ears of corn. Insert a wooden craft stick 1 inch into larger end of ear; cool completely.
Untwist twine to form crinkled paper; cut paper to resemble corn husks. Attach husks to larger end of ear with raffia.