• First, preheat the oven to 350F then lightly grease the large donut pan with cooking spray.
• In a medium bowl, combine the pumpkin puree, olive oil, butter, vanilla, egg, brown sugar, and granulated sugar and whisk until smooth.
• Add the flour, pumpkin pie spice, baking powder, and sea salt. Stir the mixture just until combined. Do not overmix.
• Place the batter in a piping bag or a plastic bag over a cup and transfer the donut mixture to the bag. If using the plastic bag method, snip off one of the corners and "pipe" the batter into the prepared donut pan. This recipe should make 8 large donuts.
• Bake for 25 minutes, or until a knife of a toothpick inserted in comes out clean. Let the donuts cool for 10 minutes then transfer to a cooling rack.

The coating

• For the coating, stir the sugar and cinnamon together in a shallow container.
• When the donuts are completely cool, melt the butter and brush each donut with the melted butter. Making sure to get every corner of it. One by one dip the donuts in the cinnamon sugar to coat them.
• Enjoy!