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In a bowl, mix the dry ingredients such as flour, salt, cream of tartar and baking soda. Set aside.
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In another bowl, whisk together butter and sugar until creamy and smooth.
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Add in the egg and vanilla and whisk well.
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Pour in the dry ingredients and mix to combine.
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Cover the bowl with plastic wrap and refrigerate for at least 30 minutes or until dough is firm.
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Preheat oven to 350°F.
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In another bowl mix the ingredients for rolling and set aside
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Use a small ice cream scoop to shape small balls of dough or you can use a spoon for that.
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Roll the balls of dough in the cinnamon sugar mixture to coat.
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Place balls in a baking sheet covered with parchment paper. Make sure to leave about 2 inches space between the balls, as they will expand.
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Bake for about 10 minutes.
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Let cool.