WTF? These marshmallows are apparently award winners and "America's favorite." That might have some correlation to it being the only brand available at many grocery stores. Which is cause and which is effect? They're just marshmallows. While these can be used for many different purposes in circuitry snacks, there are a few places where they really excel: As battery cells, as large electrolytic capacitors, and (when painted with a suitable set of colored stripes) resistors.
Part of the circuitry snacks project: Edible models of functioning electronic circuits. Designed for fun, for geeks, for kids, and for teaching and learning electronics.