Preheat oven to 350 degrees.

Brush donut pans with oil.

In a large mixing bowl, combine oil, eggs, pumpkin, and pumpkin pie spice and stir until smooth.

In a sparate bowl, combine flour, salt, and baking powder and mix well.

Add dry ingredients to wet ingredients and stir until well combined.

Fill wells of donut pan 3/4 full with batter.

Bake donuts for 15-18 minutes or until toothpick tests clean.

Remove from oven and let cool on rack for 1-2 minutes.

Loosen edges of donuts from pan and place donuts on cooling rack.

If you want to top with cinnamon sugar: Melt 1/2 stick butter in a medium bowl in microwave. In separate bowl, combine 1/2 cup sugar and 1 Tablespoon of cinnamon.

While donuts are still warm, dip half of donut in to melted butter and then dip into cinnamon sugar mixture.

Allow to cool completely.

Store in an airtight container for up to 3 days.