1. Preheat oven to 325 degrees. Line a baking sheet with a silicone mat or parchment paper, set aside.

2. In bowl of stand mixer beat butter and both sugars until light and fluffy, about 2 minutes. Add in egg, yolk and vanilla and beat for another minute on medium, scraping the sides as needed.

3. Turn mixer to medium and mix in baking soda, cream of tartar, salt and 1 teaspoon of cinnamon. Mix for another 30 seconds until just combined.

4. Add in flour, mixing on low until just combined. In a separate small bowl make your Cinnamon Sugar mixture by mixing together cinnamon and sugar.

5. Using a cookie scoop or spoon, measure out about 2 Tablespoons of dough and roll into a ball. Then roll each cookie dough ball into the Cinnamon Sugar mixture.

6. Place on prepared baking sheet about 2 inches apart. (these spread a bit) Bake for 10-12 minutes. The edges should look slightly golden, but the middle should look slightly soft still.

7. Let cool on the cookie sheet and then transfer to a wire rack.