Heat oven to 400°F and line a cookie sheet with parchment paper or a silicone mat.

In a medium bowl, whisk together flour, cream of tartar, baking soda, and salt. Set aside.

In a large bowl, beat butter and 1 1/2 cups of sugar until light and fluffy, about 2-3 minutes.

Add eggs one at a time, mixing well after each addition and scraping down the bowl as needed.

Stir in vanilla extract until well combined.

Gradually add dry ingredients, mixing until just combined.

In a small bowl, mix remaining 3 tbsp of sugar with ground cinnamon.

Scoop tablespoon-sized balls of dough, roll in cinnamon-sugar mix, and place on cookie sheet, leaving 2 inches between each.

Bake for 6-8 minutes until edges are golden. Let cookies sit on sheet for 2-3 minutes before transferring to a cooling rack.

Store cookies in an airtight container to keep fresh.