Creating these delightful Apple Snickerdoodles involves a few simple steps that even novice bakers can follow with ease.

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, cream of tartar, cinnamon, and salt. Set aside.
3. Cream Butter and Sugars: In a large bowl, use an electric mixer to cream the softened butter, granulated sugar, and brown sugar together until fluffy.
4. Add Eggs and Vanilla: Beat in the eggs, one at a time, followed by the vanilla extract until well combined.
5. Combine Wet and Dry Ingredients: Gradually add the dry ingredient mixture to the wet mixture. Stir until everything is just combined.
6. Fold in Apples: Gently fold in the diced apples until they are evenly distributed throughout the dough.
7. Prepare Cinnamon Sugar: In a small bowl, mix the 1/4 cup granulated sugar with the tablespoon of cinnamon for rolling.
8. Form Cookies: Use a tablespoon or cookie scoop to form dough balls. Roll each ball in the cinnamon-sugar mixture until fully coated.
9. Place on Baking Sheet: Arrange the dough balls on the prepared baking sheets, leaving enough space between them to spread.
10. Bake: Bake for 12-15 minutes or until the edges are lightly golden. The centers may look soft but will firm up as they cool.
11. Cool: Remove the cookies from the oven and let them cool on the baking sheets for about 10 minutes. Then transfer them to wire racks to cool completely.

These steps ensure a batch of warm, wonderfully spiced Apple Snickerdoodles come out of your kitchen.