Preheat the oven to 350°F. Lightly grease two standard doughnut pans.

In a large mixing bowl, beat together the oil, eggs, sugar, pumpkin, spices, salt, and baking powder until smooth.

Whisk in the flour and xanthan gum until smooth.

Fill the wells of the doughnut pans about 3/4 full (about 1/4 cup of batter in each well).

Bake the doughnuts for 15 to 17 minutes, or until a toothpick or cake tester inserted into the center comes out clean.

Remove the the doughnuts from the oven and let them cool in the pan for about 3 to 5 minutes. After they've cooled a bit, loosen their edges, and transfer them to a rack.

While the doughnuts are still warm coat them in cinnamon-sugar. You do this by hand, just rubbing each doughnut with the sugar coating, or you can gently shake them in a bag with the cinnamon-sugar.