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

In a medium 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. Scrape down the bowl as needed.

Mix in the vanilla extract.

Gradually add the dry ingredients and mix until everything is combined.

In another small bowl, mix the remaining 3 tablespoons of sugar with the cinnamon.

Scoop tablespoon-sized balls of dough and roll each in the cinnamon-sugar mixture. Place them about 2 inches apart on the prepared cookie sheet.

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

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