This is an incredibly easy recipe for marshmallow flakes that can be made using only a microwave. Simply melt marshmallows and unsalted butter in the microwave, mix them together, add cornflakes, and let it harden. No cooking is required, and it only requires a few ingredients, so it can be made in no time. It's perfect for beginners in baking or for making snacks with children. The combination of crispy cornflakes and chewy, sweet marshmallows is irresistible.