In a large bowl, combine popcorn and crushed Oreos.
In a large sauce, combine the corn syrup, margarine, cold water, confectioners’ sugar and marshmallows over medium heat.
Stir until the mixture comes to a boil.
Carefully remove from heat and pour the mixture over the popcorn and crushed cookies until each piece is coated.
Spray your hands with non-stick cooking spray and quickly shape the popcorn mixture into balls before it cools.
Let cool on a sheet of wax paper.
Wrap each ball with wax paper or plastic wrap and store at room temperature.