1. Preheat the oven to 350°F (175°C). Grease or line an 8×8 inch baking pan with parchment paper.
2. In a bowl, whisk together the flour, baking soda, cream of tartar, and salt.
3. In a separate large bowl, cream the butter and sugar together until light and fluffy.
4. Beat in the egg and vanilla extract until well combined.
5. Gradually add the dry ingredients to the wet ingredients and mix until just combined.
6. Spread the dough into the prepared baking pan evenly.
7. Sprinkle the top with cinnamon sugar.
8. Bake for 20-25 minutes or until the edges are golden.
9. Allow to cool before cutting into bars.
A Prep Time: 15 mins | Cooking Time: 25 mins | Total Time: 40 mins | Kcal: 200 | Servings: 12
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