Cream together butter and sugar for at least 2 minutes.

Add in eggs, vanilla, soda, salt, and cream of tartar until combined in the batter.

Slowly add in flour 1 cup at a time.

Roll out to 1/2"to 1/4". Cut dough out with cookie cutters. Chill for 3-4 hours.

Bake at 375 degrees for 6-8 minutes. DO NOT OVERBAKE!

Notes: The best results that I have had baking this cookie is when they are a bit under-baked. The color will be a light brown and the center of the cookies drop down a little bit from the edges.