Preheat the oven to 350°F
Generously spray a donut pan(s) with baking spray or brush with oil. Place the donut pans onto a baking sheet and set aside. Add the flour, baking powder, baking soda, salt, and pumpkin pie spice into a mixing bowl and whisk to combine. Set aside.
2 cups all purpose flour, 1 teaspoon baking powder, 1 teaspoon baking soda, 1/2 teaspoon salt, 2 teaspoons pumpkin pie spice
In a large mixing bowl add the oil, brown sugar, granulated sugar, eggs, sour cream, and vanilla and whisk until combined.
1/2 cup vegetable oil, 3/4 cup brown sugar, 1/4 cup granulated sugar, 2 large eggs, 1/3 cup sour cream, 1 teaspoon vanilla extract
Fold in the pumpkin puree with a silicone spatula. 1 cup pumpkin puree
Add the flour mixture and gently fold into the wet mixture with the spatula.
Transfer the mixture to a large piping bag and snip the end off. Pipe the mixture into each donut cup filling about two-thirds full. Place the donut pan(s) into the center of the oven and bake for 12 minutes or until a toothpick inserted into the middle of the donuts comes out clean.
Leave to cool in the pan for a few minutes. When they are cool enough to handle pop out the donuts and put them onto a wire rack to continue cooling.