This recipe for "Marshmallow Oreo Cookies" is easy to make using just three ingredients: marshmallows, Oreos, and butter, and only requires a microwave and freezer. It's an adaptation of the popular Korean Cheongdeuk Cookie, designed to be quick and easy to make. Since it only involves melting and mixing the ingredients, shaping, and chilling until firm, even cooking beginners can easily try it. It's presented in a time-attack format where the cooking time is measured, and the time-saving technique of doing the dishes while cooking is also appealing. You can enjoy a crispy and fluffy texture when chilled thoroughly, or a soft cookie-like texture when brought to room temperature, and you can also customize it with granola or nuts.