Preheat the oven to 350 F. In a medium bowl, whisk flour, salt, baking soda, and ground cinnamon together. In a large bowl, mix together butter, pumpkin and both sugars until fluffy.
Add in the egg and vanilla extract until smooth. Add in the flour mixture and mix until it is fully combined. Use a cookie scoop to place the cookies onto a large ungreased baking sheet at least 2-inches apart. Bake for 10-12 minutes.