Did you know that "ginormous" is now in the dictionary? Now that you've got just the sentences you need, look at the words you used, and how accurately they portray what you wish to convey. Are the marshmallows gigantic? Enormous? Or GINORMOUS? Take a peek through a thesaurus, just for kicks, and see what words you could also use. Even if you don't use any of them, you can still improve your vocabulary.