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In mixing bowl combine the flour, cream of tartar, baking soda and cinnamon. Set that aside while you mix the wet ingredients.
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In a large mixing bowl combine the softened butter, granulated sugar and the brown sugar with an electric mixer. This should take about 1 - 2 minutes.
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Now add your egg, egg yolk and vanilla extract to the wet mixture; combine, making sure to scrape the sides of the bowl to get everything well incorporated.
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Add the dry ingredients into your wet ingredients and mix until combined. Cover and place in your refrigerator for about an hour (no less than 30 minutes!).
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After the dough has chilled for 1 hour pre-heat your oven to 350 degrees F and prepare your baking sheets with parchment paper.
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Mix your coating ingredients in a small mixing bowl.
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Using a spoon or a cookie scoop measure about 1 to 1.5 tablespoon balls out of the dough, making approximately 45 - 48 total.
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Make sure to cover each ball evenly in the coating mixture and set it on the baking sheet. Give space between each ball so the cookies can spread during baking.
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Bake each batch of cookies for 8 - 10 minutes, until set and slightly golden. Allow them to cool for at least 5 minutes before removing them to a wire rack to cool completely.