You'll never need another Snickerdoodle Recipe after this one! Slightly crispy edges with big chewy centers, just how they should be. Snickerdoodle heaven.
Preheat oven to 375 degrees. Line 2 lightly colored baking sheets with parchment paper and set aside.
In a large bowl, stir shortening, butter, and sugar together until light and pale in color, 1 1/2 minutes. Whip in eggs and vanilla. Scrape sides of the bowl and stir again briefly. Add in flour, cream of tartar, baking soda and salt and stir until incorporated. Scrape sides and stir again briefly.
In a small, shallow bowl, stir sugar and cinnamon together.
Using a cookie scoop {1 1/2 tablespoon size}, scoop dough into even mounds on the baking sheet. Roll each dough ball in cinnamon-sugar mixture. Bake 8-9 minutes or until puffed and look slightly underdone. Remove from oven and cool 3 minutes on the baking sheet before transferring to cooling racks. Store in airtight containers for up to 4 days.