Preheat oven to 375°F (190°C) and line baking sheets with parchment paper.
In a bowl, whisk flour, cream of tartar, baking soda, cinnamon, and salt.
In another bowl, beat butter and sugar until creamy.
Add egg, egg yolk, and vanilla extract, mixing well.
Gradually mix dry ingredients into wet ingredients until a thick dough forms.
Mix topping ingredients in a small bowl.
Roll dough into balls and coat in cinnamon sugar.
Place on baking sheets and bake for 10 minutes.
Gently flatten cookies while warm and let cool completely.