Melt the butter in your saucepan over low heat.

Once butter is completely melted, add in the entire bag of marshmallows. Keep at a low-to-medium heat and stir occasionally. The marshmallows will melt down into a luscious goo.

Add a dash of vanilla extract to the marshmallows and butter and blend together thoroughly.

Spray your mixing bowl with non-stick spray.

Add 8 cups of Cookie Crisp Cereal to the mixing bowl. Once the marshmallows are completely melted, pour it over top of cereal.

Spray a spatula with non-stick spray and use it to mix the melted marshmallow and butter with the cereal. Work quickly!

Pour the cereal mixture into sprayed 9x13 baking dish.

Use the spatula to spread the cereal and marshmallow mixture evenly throughout the dish. Coat a sheet of wax paper with non-stick spray and use it to push the cereal mixture down slightly, to pack the marshmallow treats into dish.

Let your Cookie Crisp Marshmallow Crispy Treats cool for 2 hours or until they are completely set.

Cut with a sharp knife and serve.