In a medium-size bowl whisk together the flour, cream of tartar, baking soda, and salt together. Set aside.
2 3/4 cups all-purpose flour, 2 teaspoon cream of tartar, 1 teaspoon baking soda, 1/2 teaspoon salt
In a large mixing bowl cream together the sugar and butter until light and fluffy, about 3-5 minutes. Add the eggs one at a time and mix well. Add the vanilla and blend well.
1 cup unsalted butter, softened, 1 1/2 cups granulated sugar, 2 large eggs, 1 teaspoon vanilla
Add dry ingredients to the wet ingredients and mix well. Chill for at least 1 hour.
Preheat the oven to 350F degrees.
Mix the sugar and cinnamon together in a small bowl. Shape the dough into 1-inch balls and roll in the cinnamon-sugar mixture to coat evenly. Place 2 inches apart on a parchment-lined baking sheet.
1/4 cup granulated sugar, 1 Tablespoon cinnamon
Bake for 12-14 minutes, until golden. Rotate the pan in the oven halfway through the baking time, if needed.
Allow the cookies to cool for 3-4 minutes on the baking sheet. Then transfer to a wire rack to cool completely.