Preheat your oven to 400 degrees Fahrenheit. Grease a medium 12-donut donut pan with vegetable oil cooking spray or butter and set aside.

In a large bowl, whisk together the flour, sugar, baking powder, cinnamon, nutmeg and salt.

In a glass measuring cup, measure the buttermilk.

Add the eggs and vegetable oil to the buttermilk and whisk with a fork to combine and break up the eggs.

Add the wet ingredients to the dry ingredients and mix together gently with a rubber spatula just until any streaks of flour disappear.

Add the batter to a large piping bag and pipe the donuts into the donut pan cavities only about 1/2 to 2/3 full.

Bake at 400 degrees Fahrenheit for about 7-9 minutes, or until the donuts are just golden brown on top and lose their shine.

Cool in the donut pan for about 5 minutes before removing to a wire rack to cool completely.

Repeat the steps for the next 12 donuts.

Once cooled, dip the donuts in powdered sugar.