Preheat your oven to 400°F (200°C). Prepare a dark cookie sheet with a silicone baking mat or parchment paper.

In a medium-sized bowl, combine the flour, cream of tartar, baking soda, and salt. Set aside.

In a large mixer bowl, cream together the butter and 1 1/2 cups of sugar until light and fluffy (about 2-3 minutes).

Add the eggs one at a time, mixing until combined after each addition. Make sure to scrape down the bowl as needed.

Mix in the vanilla extract until well combined.

Gradually add the dry ingredients and mix until fully combined.

In a separate small bowl, mix the remaining 3 tablespoons of sugar with the ground cinnamon.

Scoop tablespoon-sized balls of dough and roll each in the cinnamon-sugar mixture.

Place the dough balls about 2 inches apart on the prepared cookie sheet.

Bake for 6-8 minutes until the edges are just golden.

Let them cool on the baking sheet for 2-3 minutes before transferring them to a cooling rack.