Preparation Steps

• Preheat oven to 375°F (190°C). Line baking sheets with parchment paper.
• In a medium bowl, whisk together the flour, cream of tartar, baking soda, and salt.
• In a large bowl, beat the butter and 1.5 cups sugar until fluffy. Add eggs one at a time, then vanilla extract, beating well after each addition.
• Gradually add the dry ingredients to the wet ingredients, mixing until combined.
• In a small bowl, combine 0.25 cup sugar and cinnamon for rolling.
• Roll dough into 1.5-inch balls, then roll each ball in the cinnamon-sugar mixture. Place about 2 inches apart on prepared baking sheets.
• Bake for 8-10 minutes or until edges are lightly browned but centers are still soft.
• Remove from oven and cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.