Previous pinner wrote, "Marshmallow Cupcake toppers. Cut the marshmallows in half on the diagonal, then toss in a ziplock with colored sugar sprinkles. The sprinkles only stick to the sticky cut side."
S'Mores Stuffed Cookies Recipe - A Cookie Named Desire. I'm happy to say I had the pleasure of tasting these cookies, and they are delicious! The blog post has great tips on how to help the marshmallow hold up during baking!