Popcorn balls! 3 Quarts of Popped Popcorn 6 Tablespoons of Margarine or Butter 3 Cups Miniature Marshmallows 3 Tablespoons of Dry Jell-O Melt Butter over medium heat in a large pan. When Butter is almost completely melted, add Marshmallows. Once Marshmallows are melted, add the DRY Jell-O. Mix in well.