Preheat the oven to 350 degrees Fahrenheit. Grease a donut tin with nonstick spray and set aside.
In a large bowl, whisk together the flour, baking soda, baking powder, salt and spices. Set aside.
In a different medium sized bowl, whisk brown sugar, granulated sugar and melted butter together until butter is absorbed. Add eggs and vigorously whisk until combined. Stir in pumpkin puree.
Pour wet ingredients into the large bowl of dry ingredients and mix until no flour pockets remain (avoid over-mixing). Spoon or pipe batter into prepared donut tin.
Bake at 350 degrees Fahrenheit for 12 to 14 minutes or until a toothpick inserted in the center comes out with little to no crumbs. Let the donuts cool in the pan for 2 minutes before rolling in cinnamon sugar.
For the topping, whisk together the sugar and cinnamon and dip into the cinnamon and sugar mixture and make sure to coat all sides. You can also dip the donuts in melted butter then cinnamon sugar if you prefer a more decadent treat, but we prefer them without butter.
Serve immediately