Preheat oven to 350.
In a large bowl, whisk together flour, sugar, baking powder, salt, cinnamon, and nutmeg until blended.
In a medium bowl, beat the egg.
Add vanilla, vegetable oil and buttermilk, to the egg. Beat until blended.
Add wet mixture to dry mixture and stir just until smooth.
Transfer mixture to a piping bag.
Heavily grease donut pan and fill each donut cavity 2/3 full.
Bake 6-8 minutes until lightly browned or toothpick inserted in center comes out clean.
Allow to cool in pan for several minutes.
Use a knife to carefully loosen and place on wire rack.
Add powdered sugar to a brown bag.
When donuts are just slightly warm, place in brown bag and gently shake to coat.