Preparation Steps

• Preheat the oven to 350°F (175°C).
• In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until smooth.
• Beat in the eggs one at a time, then stir in the vanilla.
• Combine the flour, cream of tartar, baking soda, and salt; mix into the creamed mixture until just blended.
• Roll the dough into balls, then roll them in cinnamon sugar.
• Place the dough onto ungreased baking sheets and slightly flatten each ball.
• Bake for 8 to 10 minutes until they are just set. Let cool on the baking sheet for a few minutes before transferring to a wire rack.