7-Minute Marshmallow Frosting

Perfectly light and fluffy for frosting a rich chocolate cake, deliciously-fun S\\\'mores cupcake or fudgy S\\\'mores pie, see how to make 7-Minute Marshmallow Frosting, step-by-step.

Place sugar, cream of tartar, salt, water, and egg whites in the top of a double boiler. Beat with a handheld electric mixer for 1 minute. Bring some water to a boil in the bottom pan portion of the double...
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