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Sift together sugar and cocoa powder.
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In a large bowl, beat the egg whites, cinnamon, and cream of tartar with an electric mixer on medium speed until it forms soft peaks.
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Beat in the sugar mixture one tablespoon at a time.
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Beat the entire mixture on high until it's glossy and stiff.
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Line two baking sheets with parchment paper.
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Drop by rounded teaspoonfuls of batter onto the sheets, leaving 1-inch between.
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Bake at 250 degrees F for 40 to 45 minutes, or until the tops feel dry to the touch.
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Cool 5 minutes, then remove from parchment paper.