Instructions: Grease bottom and sides of 9x13 pan with butter or line with foil. Heat sugar, milk, butter and cheese to boiling in dutch oven over medium high heat 6-8 minutes, stirring constantly. Reduce heat to medium, Cook abot 10 minutes longer to 225 degrees on candy thermometer and then remove from heat. Quicly stir in marshmallows or 13 ounces marshmallow creme and vanilla. Pour 4 cups mixture over vanilla chips and stir to mix. Stir chocolate chips and cocoa into remaining mixture. Pour 1/3 of white mix into pan spreading evenly. Quickly pour 1/3 of chocolate mix over top and spread evenly. Repeat twice. Pull and swirl buttered knife through mixture for marbling effect. Cool until set. Refrigerate uncovered about 3 hours or until set. Cut into 1 inch squares with buttered knife.

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