Preheat the oven to 350℉ and spray the donut pan with non-stick cooking spray.

In a medium mixing bowl, whisk together the pumpkin puree, white and brown sugars, oil, eggs, and vanilla until there are no lumps.

In a large mixing bowl, mix together the all-purpose flour, pumpkin pie spice, cinnamon, salt, baking soda, and baking powder.

Pour the pumpkin mixture into the dry ingredients and stir just until combined; do not over mix.

Spoon or pipe the batter into the donut pans, filling them ¾ full. Tap the pan gently on the counter and place in the oven to bake for 10 minutes.

Remove the donuts from the oven. Turn the pan over onto a cooling rack to release the donuts, using a knife if necessary.

In a shallow bowl, mix together ground cinnamon and sugar. Brush or dip each donut in melted butter, then coat in the cinnamon sugar mixture.

Place the donuts onto a serving tray and serve.