Preheat oven to 375 degrees.

In a large mixing bowl, beat together butt, cream cheese, and sugars until light and fluffy.

Add in the egg, vanilla, salt, cinnamon, cream of tartar, and baking soda. Mix well.

Slowly add in the flour on low speed and mix just until combined.

In a pie plate or small bowl, mix together the sugar and cinnamon for the topping. Set aside.

Use a cookie scoop to scoop out the dough. Roll each in to a ball and then roll in cinnamon sugar topping.

Place on a cookie sheet that is lined with parchment paper. Slightly flatten cookie with back of a spoon.

Bake 10 minutes. Middle will still seem unset, but will firm up while cooling.

Store in airtight container.

Enjoy!!