Spray a 9 x 13 inch pan with non-stick cooking spray. Measure 6 cups of cereal into a large bowl.

In a medium sauce pan on medium to medium-low heat, melt butter and stir in marshmallows. Keep stirring until all of the marshmallows are melted.

Pour the marshmallow mixture into the cereal and stir until all of the cereal is covered. Transfer to the prepared pan. Spray a rubber scraper with non-stick spray and spread out the cereal in the pan until it is even and flat. Let it sit for 4 hours and then cut into 24 pieces and enjoy!