Preheat oven to 400 degrees.
Use a baking spray to prep your doughnut pan.
Set the pan to the side.
Whisk together the flour, baking powder, baking soda, cinnamon, salt and sugar in a large bowl.
Whisk together the whole milk, sour cream , and eggs into a separate bowl.
Whisk in the melted butter, vegetable oil, and vanilla
Gradually whisk in the wet ingredients into the dry ingredients and stir just until combined
Spoon the batter into the doughnut pan.
Bake at 400 degrees for 9 minutes.
Allow doughnuts to cool a few minutes in the pan.
Transfer the donuts to a wire rack to completely cool.