1. Line an 8-inch square pan with foil; butter foil. Combine marshmallow cream, sugar, evaporated milk and butter in a large, heavy pan. Bring mixture to a boil over medium-high heat. Cook, stirring constantly, until mixture reaches 235°F on a candy thermometer, 10 to 15 minutes.
2. Remove from heat and stir in candy corn and chocolate chips, stirring until chocolate melts. Immediately transfer to foil-lined pan and smooth top until even. Chill until set, at least 2 hours. Cut into one inch squares and give away immediately so you don't eat it all yourself!