Preheat oven to 350 Fahrenheit. Grease about nine cavities of a donut pan with olive oil, baking spray or butter. Lightly sprinkle some flour over them. Flip pans over and top bottoms of the pans to remove excess flour.
In a large bowl, whisk to combine the flour, baking powder, sugars, salt and cinnamon. Set aside
In a medium sized mixing bowl, whisk to combine the olive oil, sour cream, milk, orange juice, orange zest and egg.
Pour the wet ingredients into the dry ingredients. Stir til just combined. Transfer mixture to a piping bag or medium zip lock bag then snip off a corner and pipe dough into donut pans. Fill about 3/4 full. Alternatively, you can use a spoon to spoon the batter in. Bake 9-11 minutes or until a toothpick comes out clean when inserted in the middle of a donut. Allow to cool in pan 5 minutes. Turn donuts out onto a baking rack. Brush each donut with olive oil while the donuts are still warm then toss in the cinnamon sugar to coat. Place donuts on a cooling rack as you continue to coat them all with cinnamon sugar.
Cinnamon Sugar Coating
While the donuts are baking, stir to combine the cinnamon and sugar in a shallow dish or bowl.
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Notes
Donuts are best enjoyed the day they are made. Store leftovers in an airtight container for up to 3 days. Use a microplane to zest the orange.Use a good quality extra virgin olive oil. Swap in vegetable oil if you prefer. I use two six cavity donut pans to make these donuts. If you only have one pan, you can make the first batch then cool, wash, and grease the pan and use it again.