In a large mixing bowl add the flour, sugar, baking powder, baking soda, salt, and nutmeg. Whisk together.
Make a well in the center of the dry ingredients and add the buttermilk, egg, vanilla, and oil. Mix to combine.
Spray donut pan with non-stick spray. Add the batter to the pan, you should get 6 donuts.
Bake in a 325-degree oven for 12 to 14 minutes, or until done. The donuts are ready when you insert a toothpick and it comes out clean.
Meanwhile, mix together cinnamon and sugar in a bowl and set aside.
Remove the donuts from the pan and dip in the cinnamon-sugar mixture while they are still warm.
Let cool slightly and enjoy!
The donut pan I use is 3.5" inches in diameter and makes 6 donuts.
My pan holds a maximum of ⅓ cup of batter.
I fill each donut mold all the way to the top. If you prefer not to do this, you could get a couple more donuts out of each recipe.
If you would like to use this recipe to make muffins I would suggest the jumbo muffin pan, or make more than 6 regular size muffins. I have not tried this myself yet, but I will update my post when I do.
If you do use a muffin pan, or any different size pan than what I use in this recipe, you might want to adjust the baking time accordingly.