Preheat your oven to 350°F. Grease a standard-size donut pan and set it aside.

In a large bowl, whisk together the flour, xanthan gum, cornstarch, baking powder, baking soda, kosher salt, nutmeg, and sugar until combined.

Create a well in the center of the dry ingredients. Add the butter, eggs, yogurt, and vanilla, mixing until just combined.

Fill the donut pan wells until nearly full. For perfectly shaped donuts, use a piping bag with a large open tip to pipe the batter in smoothly.

Wet your pointer finger and run it along the center of each well to keep the donut holes from closing while baking.

Pop the tray in the middle of the preheated oven and bake for about 12 minutes or until the donuts are set and lightly browned.

Remove the pan and allow the donuts to cool for 5 minutes.

For an optional glaze or sugar-coating, mix 1 cup confectioners’ sugar with 2 to 4 teaspoons milk or buttermilk in a bowl until smooth.

Dip the tops of your cooled donuts in melted butter, then dredge in 1/2 cup granulated sugar for a sweet finish.