1. In a large bowl, mix together butter, sugars, and vanilla extract until combined. (Save 2 tsp. of white sugar for the coating mixture.) Slowly incorporate flour, 1 teaspoon of cinnamon, cream of tartar, and salt. Mix together until mixture is well combined.
2. Use a tablespoon measuring spoon to measure out dough and use hands to form into a ball. Set aside once rolled.
3. On a plate, mix together remaining cinnamon and 2 teaspoons of sugar. Roll dough bites in the mixture.
4. Place in an airtight container and refrigerate until served.

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