Preheat your oven to 350 degrees
In a large bowl, combine 1/2 cup of sour cream, 1 egg, 1/3 cup of canola oil, 1 teaspoon of vanilla extract, 1/4 cup of granulated sugar and 1/4 cup of brown sugar and whisk until fully incorporated
Place a mesh sifter over the bowl and add 1 1/3 cup of all purpose flour, 1 teaspoon of baking powder, 1/4 teaspoon of baking soda, 1/4 teaspoon of ground cinnamon and 1/8 teaspoon of salt into the sifter and sift the dry ingredients into the bowl
Mix until all of the ingredients are just combined
Grease a doughnut pan with non-stick spray
Fill each cavity about half way with batter
Bake the doughnuts in a 350 degree oven for about 8 minutes or until the doughnuts feel springy to the touch
Transfer the doughnuts onto a cooling rack to cool completely before dipping, glazing or frosting