Snickerdoodle Cookie Bars (Edit recipe)

For the cookie dough:

1. Line a 9-inch square pan with parchment paper.
2. In a medium-sized bowl, whisk together the flour, cream of tartar, salt.
3. In a separate bowl, beat the butter and sugar together until just combined. Add the eggs one at a time and mix until just combined. Add the vanilla and mix.
4. Fold the dry ingredients into the wet until just combined.
5. Transfer the dough to the prepared pan and use another piece of parchment paper to press the dough out as evenly as you can. Use a small measuring cup to smooth it out.
6. Place the cookie dough in the fridge to chill for 30 minutes.
7. While the dough is chilling, preheat the oven to 350 degrees F. Make the cinnamon sugar topping by combining the sugar and cinnamon.
8. Sprinkle the cinnamon sugar on the dough, leaving a small border around the edges so you can see when they turn golden in the oven. Bake the cookie bars for about 27 minutes.
9. Allow the bars to cool completely before cutting.