In a medium bowl, combine the flour, cream of tartar, baking soda, salt, cinnamon, ginger, nutmeg, cloves, and allspice. Set aside.
In the bowl of a stand mixer fitted with a paddle attachment (or using a handheld mixer), beat the butter, brown sugar, and granulated sugar until smooth and creamy.
Mix in the pumpkin puree and vanilla extract until combined.
Using a silicone spatula, fold in the flour mixture until just combined.
Cover the bowl with plastic wrap and chill in the fridge for 1 hour.
Preheat the oven to 350°F (180°C) and line a large baking sheet with parchment paper.
In a small shallow bowl, combine the 50 g (¼ cup) of granulated sugar and 1 ½ tsp of cinnamon for rolling.
Use a 3 tbsp cookie scoop to portion out the dough and roll each cookie into a ball with your hands.
Coat each cookie in cinnamon sugar and place 1 ½-2 inches (4-5 cm) apart on the prepared baking sheet.
Bake for 12-14 minutes or until the edges have set and the centers look slightly underdone. You should also see a few cracks on top.
Cool on the baking sheet for 5 minutes then transfer to a cooling rack to cool completely.