Gather the ingredients - * Butter * White sugar * Brown sugar * Egg * Vanilla extract * Flour * Cream of tartar * Baking soda * Apple * Cinnamon
Using a cheese grater with large holes, shred a peeled apple until you have 1/2 cup. Squeeze the liquid out and set aside the shredded apple.
In a large mixing bowl, beat together butter, white sugar, and brown sugar until well combined. Add in egg and vanilla extract, continuing to beat for 1 minute.
Add in the flour, cream of tartar, and baking soda. Mix until just combined before folding in the shredded apple.
Cover cookie dough and place in refrigerator for at least 60 minutes.
Preheat oven to 350 degrees and line a sheet pan with parchment paper or a silicon mat. Mix together cinnamon and sugar in a bowl and set aside.
Remove cookie dough from refrigerator and scoop out cookie dough into tablespoon-sized pieces. Roll into a ball before rolling in cinnamon sugar mixture. Place on sheet pan, leaving at least 3" between each cookie as they will spread in the oven.
Repeat until sheet pan is full. Place in oven and bake for 9-11 minutes.
Remove from oven and allow to sit on the sheet pan for a few minutes before transferring to a cooling rack.