Preheat oven to 350F.
Prepare cookie sheets by spraying with non-stick spray and set aside.
In a large mixing bowl, sift together flour, cream of tartar, baking soda and salt. Set aside.
In a stand mixer, cream together margarine and sugar on med-high (3-4 minutes)
Reduce to medium speed. Add eggs one at a time and then add vanilla. Mix well (1 minute).
Reduce speed to slow. Slowly add flour mixture to the stand mixer.
Mix until combined, scraping down sides as necessary.
In a small bowl/plate, combine sugar and cinnamon for coating.
Use a cookie to scoop to scoop dough. Roll in ball and then roll in cinnamon sugar until well coated.
Place on prepared cookie sheets, 2 inches apart.
Bake 10-12 minutes.
Allow to cool on baking sheets for 5 minutes before moving to wire rack to cool completely.
Store in an air tight container.