Preheat the oven to 350. Prepare a donut pan with grease and set to the side.
In a large bowl, combine the oil, eggs, sugars, pumpkin puree, spices, baking powder, baking soda, salt, and vanilla. Use a whisk to make sure everything is fully combined.
Add the flour to the mixture to the bowl and whisk to combine. Don't over mix the batter.
Using a piping bag or a spoon, fill the donut pan about ¾th of the way full. Place in the oven and bake for 8-12 minutes.
Let the donuts fully cool on a rack. While the donuts are cooling, prepare the cinnamon and sugar topping, with the melted butter.
Use a pastry brush to cover the donuts in melted butter on both sides. Then toss the donuts in the cinnamon and sugar mixture until fully covered.