One Box of Lucky Charms Just Magical Marshmallows. Brand New Sealed 4oz Different box cover images. You're the magic maker with General Mills Lucky Charms Limited Edition Just Magical Cereal Marshmallows. Every bag has all of your favorite magical Lucky Charms marshmallows-and only marshmallows! So make your marshmallow dreams come true. Bake rainbow cereal bars with the mini marshmallows. Use the cereal marshmallows as birthday cake decorations. Sprinkle a handful over sundaes for ice cream toppings. Or toss the dehydrated marshmallows with popcorn for a sweet and salty snack mix.