. Preheat the Oven:

• Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.

2. Mix Dry Ingredients:

• In a medium bowl, whisk together the flour, baking soda, cream of tartar, salt, and ground cinnamon.

3. Cream Butter and Sugars:

• In a large bowl, beat the softened butter, granulated sugar, and brown sugar until light and fluffy.
• Mix in the eggs and vanilla extract until fully combined.

4. Combine Wet and Dry Mixtures:

• Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
• Gently fold in the diced apples.

5. Shape the Cookies:

• In a small bowl, mix together the granulated sugar and ground cinnamon for the coating.
• Scoop tablespoon-sized portions of dough and roll them into balls. Roll each ball in the cinnamon sugar mixture.

6. Bake:

• Arrange the cookie dough balls on the prepared baking sheet, spacing them about 2 inches apart.
• Bake for 10-12 minutes, or until the edges are set and the tops are slightly cracked.

7. Cool and Serve:

• Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
• Serve and enjoy the perfect blend of cinnamon and apple flavors!