Creating Quick Apple Cinnamon Snickerdoodle Cookies is straightforward. Simply follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). 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 Sugar: In a separate large bowl, beat the softened butter and ¾ cup of granulated sugar together until light and fluffy.
4. Add Egg and Vanilla: Mix in the egg and vanilla extract, beating until well combined.
5. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until just combined.
6. Fold Apples: Gently fold in the diced apples, ensuring they’re evenly distributed throughout the dough.
7. Prepare for Rolling: In a small bowl, combine the ¼ cup granulated sugar and 1 teaspoon ground cinnamon.
8. Form Cookies: Scoop tablespoon-sized balls of dough and roll them in the cinnamon-sugar mixture.
9. Place on Baking Sheet: Arrange the rolled cookie dough balls on the prepared baking sheet, leaving enough space between them for spreading.
10. Bake Cookies: Bake in the preheated oven for 10-12 minutes, or until edges are golden and cookies are puffy.
11. Cool: Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.

Following these steps will yield incredible cookies that are sure to impress!