For the Cinnamon-Sugar Coating:
Preheat the Oven and Prepare Pans:
Make the Dough:
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In a large mixing bowl, cream together the softened butter and 1 1/2 cups sugar until smooth and light, about 2-3 minutes.
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Add the eggs one at a time, beating well after each addition.
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In another bowl, whisk together the flour, cream of tartar, baking soda, and salt.
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Gradually add the dry ingredients to the butter mixture, mixing until just combined.
Mix Cinnamon-Sugar Coating:
Shape the Cookies:
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Scoop about 1 tablespoon of dough and roll it into a ball.
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Roll the dough balls in the cinnamon-sugar mixture until well coated.
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Place the coated balls on the prepared baking sheets, spacing them about 2 inches apart.
Bake:
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Bake in the preheated oven for 8-10 minutes, or until the edges start to turn golden and the centers are set but still soft.
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The cookies will puff up initially and then flatten out as they bake.
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