I tried making marshmallows with my whipper using nitrous oxide. It soort of worked.
The problem -- which I think I should have seen coming -- was that the yeild the recipe exceeded my whipper's capacity.
With almost anything else going through the whipper, the capacity issue wouldn't be a big deal. However, I put like, 2/3 of it in the whipper, held it at the right temperature in the whipper and that went OK. The sugar in the remaining 1/3 began to carmelize and set a little too much in the time it took for me to reload and recharge the whipper and was a goopy mess. If I were to use this method again, I would definitely adjust that, but cleaning was a bitch-- as anticipated.
Frankly, this was a great idea in theory, but a far too much trouble than it was worth in execution. The texture was indistinguishable (mouth feel, chewiness, fluffiness, intensity of sweetness) to me from marshmallows made with a regular mixer with the whisk tool. Not a total bust, but I'm also not going to repeat this any time soon.
Recipe is here:
http://www.wikihow.com/index.php?title=Make-Marshmallows&printable=yes