• In a mixer bowl combine your softened butter, pumpkin, and sugar.
  
• Mix on medium speed for 3-4 minutes until smooth.
• Add the eggs and vanilla extract. Mix on low until combined.
• In a separate bowl sift together the flour, cream of tartar, baking soda, and salt.
  
• Add the dry ingredients to the mixer while it's on low. Mix until combined.
• Chill the cookie dough for at least 30 minutes up to 2 hours.
  

Cinnamon Sugar

• Preheat your oven to 350° F. Line 2 baking sheets with parchment paper.
• Combined the sugar and cinnamon in a small bowl to create the cinnamon sugar mixture.
  
• Scoop heaping teaspoon size scoops of the chilled cookie dough and roll them into balls.
• Drop the cookie dough balls into the cinnamon sugar mixture and roll them around until they are coated.
• Place on a parchment lined baking sheet and bake in the preheated oven for 12-14 minutes.
  
• Cool on baking sheet for 5 minutes before moving to a wired rack to cool.