Preheat your oven to 400°F. Get a cookie sheet ready by lining it with parchment paper or a silicone mat.

In a medium bowl, mix together the flour, cream of tartar, baking soda, and salt. Set this aside for now.

In a large mixing bowl, beat the softened butter and 1 1/2 cups of sugar together until it's light and fluffy—this should take about 2-3 minutes.

Add the eggs one at a time, mixing well after each addition. Don't forget to scrape the bowl sides to get everything mixed nicely!

Stir in the vanilla extract until everything is blended smoothly.

Gradually add the dry ingredients into the butter mixture, mixing until just combined.

In a small bowl, combine the remaining 3 tablespoons of sugar with the cinnamon.

Roll about one tablespoon of dough into balls, then roll each ball in the cinnamon-sugar mixture before placing them on your prepared cookie sheet, leaving about 2 inches between each.

Bake in the oven for 6-8 minutes until they’re just lightly golden.

Once done, let the cookies cool on the sheet for 2-3 minutes, then transfer them to a cooling rack.

Store your delicious cookies in an airtight container to keep them fresh.