In a mixing bowls measure four cups of Chex cereal and set aside.
In a gallon sized Ziploc bag add two cups of powdered sugar.
In a bowl add white chocolate chips with frosting.
Melt the chocolate chips with the frosting in the mircowave for about 45 seconds and then stir until lumps are gone and creamy.
Once stirred, pour over Chex cereal mix in bowl.
Once chocolate is poured over, stir well and then drop into plastic bag, seal, and shake to coat with the powdered sugar.
Once all Chex mix is coated, add to a large bowl, mix with M&M's and marshmallows and enjoy!