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Preheat oven to 375 degrees. Line baking sheets with parchment paper or silicone baking mats and set aside.
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In a large bowl, whisk together the flour, cream of tartar, baking soda, baking powder and salt. Set aside.
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Cream the butter in a large bowl. Add the sugar and cream together with the butter until creamy and smooth using either a stand mixer or hand mixer.
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Add the eggs and vanilla and beat on medium high speed until thoroughly combined, about 2 to 3 minutes, scraping down the sides of the bowl as needed.
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Gradually add the flour mixture to the creamed mixture mixing on low speed, just until combined. Refrigerate dough for 30 minutes (optional).
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For the Cinnamon Sugar Mixture: Combine sugar and cinnamon in a small bowl. Remove dough and form into small balls.
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Roll balls in sugar and cinnamon and place on an ungreased cookie sheet.
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Bake snickerdoodle cookies for 8 to 10 minutes or until edges or lightly golden brown. Remove and let cool on sheet for two minutes before transferring to a cooling rack.
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Store in an airtight container for up to 1 week.
Tools Needed
Hand Mixer or Stand Mixer | Sheet Pans: I use a half sheet pan | Silicone Baking Mat | Cookie Scoop