Step 1: Preheat the oven

• Preheat your oven to 375°F (190°C). Line baking sheets with parchment paper.

Step 2: Cream the butter and sugar

• In a large mixing bowl, beat the softened butter and granulated sugar together until light and fluffy, about 2–3 minutes.
• Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract.

Step 3: Combine the dry ingredients

• In a separate bowl, whisk together the flour, cream of tartar, baking soda, and salt.
• Gradually add the dry ingredients to the wet ingredients, mixing just until combined.

Step 4: Prepare the cinnamon sugar coating

• In a small bowl, mix the granulated sugar and ground cinnamon.

Step 5: Shape and coat the cookies

• Scoop out tablespoon-sized portions of dough and roll them into balls.
• Roll each ball in the cinnamon-sugar mixture, coating evenly.

Step 6: Bake the cookies

• Place the coated dough balls onto the prepared baking sheets, spacing them about 2 inches apart.
• Bake for 8–10 minutes, or until the edges are set but the centers look slightly soft.

Step 7: Cool and serve

• Let the cookies cool on the baking sheets for 2 minutes, then transfer them to a wire rack to cool completely.