Instructions:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.
2. Prepare Cookie Dough: In a large bowl, cream together softened butter and sugar until light and fluffy. Beat in the egg and vanilla extract until well combined.
3. Combine Dry Ingredients: In a separate bowl, whisk together flour, cream of tartar, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until a soft dough forms.
4. Make Cheesecake Filling: In another bowl, beat together the softened cream cheese, sugar, and vanilla extract until smooth and creamy.
5. Assemble Cookies: Take a portion of cookie dough and flatten it in your palm. Place a small spoonful of cheesecake filling in the center and wrap the dough around it, forming a ball.
6. Prepare Snickerdoodle Coating: In a small bowl, mix together sugar and cinnamon. Roll each cookie dough ball in the cinnamon-sugar mixture until coated.
7. Bake: Place the coated cookie balls on the prepared baking sheets and bake for 10-12 minutes or until the edges are lightly golden.
8. Cool and Enjoy: Allow the Cheesecake Snickerdoodles to cool on the baking sheets for a few minutes before transferring them to a wire rack. Enjoy these delightful cookies with a creamy cheesecake surprise!

Note: Store any leftovers in an airtight container for lasting freshness.