Be sure to use a thick, metal cookie cutter to shape these treats. The plastic cutters aren't usually strong enough (remember, rice crispy treats are sticky), and if the cookie cutters aren't thick, they won't make it all the way through the treats.
If you prefer a less sweet treat, just serve them without spreading the icing on. They'll taste great either way.
These treats make a great after-school snack or dessert for a Halloween party.
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Halloween Rice Crispy Treats image by Stephanie Gallagher 2012, licensed to About.com Inc.