In a small bowl, mix the cream cheese with a pinch of cinnamon and set aside for the cheesecake filling.
In a large mixing bowl, combine the melted butter, vanilla extract, and brown sugar. Mix until smooth and well combined.
Add the cream cheese mixture and whisk until creamy and fully incorporated.
Add the flour, baking soda, cream of tartar, and salt. Mix until a soft cookie dough forms.
In a small skillet, cook the diced apples with granulated sugar and cinnamon until softened. Let the apple mixture cool slightly.
Fold the cooked apples into the cookie dough and mix gently until evenly distributed.
Cover and chill the dough for about 30 minutes.
Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
Scoop portions of dough onto the prepared baking sheet, leaving space between each cookie.
Bake for 10–12 minutes or until the cookies are set and the edges are lightly golden.
Let the cookies cool on the baking sheet for a few minutes.
Sprinkle with cinnamon sugar and top with chopped nuts if desired before serving.