Preheat oven to 350 degrees. Line baking sheets with silicone baking mats or parchment paper.
Use electric mixer fitted with paddle attachment to beat pumpkin puree, butter, sugar, and brown sugar until fluffy, about 3 minutes.
Next, beat in egg. Mix until well incorporated, scraping down sides as needed.
In a small bowl, stir together salt, cinnamon, pumpkin pie spice, flour, cream of tarter, and baking soda. Gradually beat into butter mixture, about 1/2 cup at a time. Place dough in refrigerator for at least 30 minutes and up to 2 hours.
Remove dough from refrigerator. In a small bowl, stir together all four coating ingredients.
Scoop dough into about 1 tablespoon sized round balls. Roll balls in coating and then place on prepared cookie sheets, about 2.5 inches apart.
Bake for 11-12 minutes, or until tops are golden brown. Let cool on cookie sheets for about 2 minutes before moving to a cooling rack.