Preheat oven to 350 degrees

Mix butter, sugar and eggs really well in a large mixing bowl - you can use an electric stand mixer, hand mixer or wooden spoon.

Combine flour, cream of tarter, baking soda and salt in a separate bowl using a wire whisk.

Gently blend dry ingredients into the butter mixture.

Chill dough in fridge for 15 minutes (you can keep it in the mixing bowl).

Blend the sugar and cinnamon in a small bowl.

Using a 1" ice cream scoop, measure out dough and roll the ball in the cinnamon sugar mixture.

Place on a baking sheet lined with parchment paper. Make sure to have space between each ball - the cookies will spread while baking.

Bake for 10 minutes.

Remove from pan immediately.