You will need all-purpose flour, cream of tartar, baking soda, cinnamon, vanilla extract, eggs, sugar, salt, and butter.
Begin by whisking together the dry ingredients (flour, cream of tartar, baking soda, cinnamon, and salt) in a medium size mixing bowl.
In a stand mixer, mix together the butter, sugar, eggs, and vanilla.
Add the dry ingredients to the mixer, one cup at a time, mixing after each addition.
Use a cookie scoop to measure the dough, the roll in your hands to make a ball shape.
Roll the cookie dough balls in the cinnamon sugar mixture.
Place the cookie dough on a baking sheet and bake at 375 degrees for 8-10 minutes.
Allow the cookies to rest on the baking sheet then transfer to a cooling rack.
Enjoy your delicious giant soft snickerdoodle cookies!