Preheat oven to 350°F. Spray a donut pan with non stick spray and set aside.
In a medium bowl, combine the brown sugar, granulated sugar, oil, and egg. Whisk thoroughly to combine.
Once combined, add the pumpkin puree, melted butter, and vanilla extract. Whisk to combine.
In a large bowl, combine the all purpose flour, cinnamon, baking soda, and salt.
Pour the wet ingredients into the dry, and mix with a rubber spatula until combined.
Fill donut pan with ¼ cup of batter in each well. To easily fill up the donut pan, place the batter in a piping bag or zip top bag with the corner snipped off.
Bake for 10-14 minutes. Cool for 5 minutes in the pan, then trasfer to a wire cooling rack.
In a medium bowl prepare the topping by whisking the granulated sugar and cinnamon together.
Once the donuts are cooled, dip them in melted butter then into the cinnamon sugar mixture until coated well.
Serve and enjoy!
Notes
If you don't have a donut pan, you can use a muffin tin. Don't forget to spray the pan with non-stick baking spray.