Preheat your oven to 350℉ and grease your donut pan.
Add all of the wet ingredients to a bowl and stir together.
Add all of the dry ingredients to the bowl and mix well with the wet ingredients.
Spoon the batter into your donut pan, about ¼ cup per donut, and then bake for 10-13 minutes, or until slightly firm to the touch.
Mix together the granulated sugar, cinnamon, and nutmeg in a bowl while the donuts bake, then set aside.
Melt the butter.
Once the donuts are cool enough to touch, dip both sides of a donut in the melted butter and then dip both sides into the cinnamon and sugar mixture to cover the donut completely in the cinnamon and sugar. Repeat this step for all donuts, then enjoy!
Notes
Store in an airtight container at room temperature for 1-2 days, or in the fridge for up to 4 days.