INGREDIENTS
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3 cups confectioners' sugar
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2/3 cup unsweetened cocoa powder (Hershey's Special Dark)
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1/4 teaspoon salt
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2 to 4 large egg whites, at room temperature
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1 tablespoon vanilla extract
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1 1/2 cups bittersweet chocolate chips
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1/4 cup graham crackers, broken into pieces plus extra for topping cookies
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1/4 cup mini marshmallows, cut in half plus extra for topping cookies