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Beat together shortening, sugar, and eggs
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Sift together flour, cream of tartar, baking soda, and salt
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Add in dry to wet in thirds, incorporating in between
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Wrap in plastic wrap and refrigerate overnight
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Preheat oven to 400
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Mix the 3 tablespoons of sugar and 1 1/2 teaspoons cinnamon
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Roll into balls
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Roll in cinnamon/sugar mixture
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Set 2 inches apart on parchment or silicone lined baking sheet
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Bake 10-15 minutes, depending on size
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Cool on baking sheet a few minutes then transfer to a wire cooling rack