Marshmallow Fluff, one of the stickiest substances on earth, is made of corn syrup, sugar, egg white, and vanilla flavor. The ingredients in marshmallows actually look a scarier: corn syrup, sugar, dextrose, modified food starch (corn), water, gelatin, tetrasodium pyrophosphate, artificial and natural flavor, artificial color (blue 1).

You can substitute marshmallow cream for whole marshmallows, although it is a bit sweeter than marshmallows. Figure on one cup of Fluff for every 12 marshmallows (or every 120 miniature marshmallows). So you need about a cup and a third for your recipe.

Most likely the biggest challenge you'll face is measuring the Fluff, which, as we mentioned is one of the stickiest substances on earth. The Marshmallow Fluff Web site suggests you measure it by weight (weigh the container of Fluff, take some out, and watch the scale to know when you've got the right amount). The site says a cup of Fluff weighs a bit more than 3 ounces per cup.

It is possible - likely, even - that your recipe specifies marshmallows because they are so much easier to measure than Fluff.