In a saucepan over medium heat, melt 1 cup of unsalted butter. Stir continuously until it turns a golden brown color and develops a nutty aroma, about 5-7 minutes. Be careful not to burn it.
In a large mixing bowl, combine the browned butter, 1 cup of white sugar, and 1 cup of brown sugar. Mix until well combined and creamy.
Add in 2 eggs and 2 teaspoons of vanilla extract to the sugar mixture. Beat until fluffy and well incorporated.
In another bowl, whisk together 2 3/4 cups of all-purpose flour, 2 teaspoons of cream of tartar, 1 teaspoon of baking soda, and 1/2 teaspoon of salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix.
Cover the bowl with plastic wrap and refrigerate the dough for at least 30 minutes to help flavors meld and make the cookies chewy.
Preheat your oven to 350°F (175°C).
In a small bowl, mix together 4 tablespoons of white sugar and 1 tablespoon of ground cinnamon.
Once the dough has chilled, scoop out tablespoon-sized portions and roll them into balls. Roll each ball in the cinnamon sugar mixture until fully coated.
Place the coated dough balls on a parchment-lined baking sheet, spaced about 2 inches apart. Bake for 10-12 minutes, or until the edges are lightly golden.
Remove from the oven and let the cookies cool on the baking sheet for about 5 minutes before transferring them to a wire rack to cool completely. Enjoy!