Preheat oven to 350F. Grease or spray a donut pan and set aside.
In a medium bowl, combine flour and baking powder.
In a large bowl, combine the pumpkin, the oil, the eggs, the sugar, the vanilla, and the spices. Whisk until combined. Add the flour and whisk just until blended.
You can pipe or spoon the batter into the donut pan. The batter is a bit sticky and we find spooning the easiest, but piping looks prettier.
Bake donuts for 15 or 16 minutes. Cool for 5 or 10 minutes, then turn out onto cooling rack.
Once donuts are completely cool, combine chocolate chips and oil in a small bowl. Microwave them 30 seconds at a time, stirring well after each time, until oil is completely mixed into melted chocolate.
Using a spoon or a piping bag to drizzle the glaze across the tops of the donuts. If you want more coverage, you can double the glaze recipe and dip in the donuts.