Preheat oven to 350 degrees
Pour 2 cups apple cider into a small saucepan and reduce down to 1/2 cup. This should take about 15 minutes or so.
Meanwhile, add 2 cups of gluten-free flour into your mixing bowl.
Then, mix into your flour the following: 1/2 tsp of baking soda, 1/2 tsp of baking powder, 1 tsp of ground cinnamon, 1/4 tsp of nutmeg, and 1/4 tsp of salt.
In separate bowl, mix the following ingredients together: 1 large egg, 2 tbsp oil, 1/2 cup milk, 1/2 cup packed brown sugar, 1/2 cup granulated sugar, and 1/2 cup warm apple cider.
Next, combine the wet ingredients into the dry ingredients and mix everything thoroughly. Do not over mix or the dough could become tough.
Grease a donut pan and pour batter in about 1/2 way full. For best results, use a sandwich baggie or piping bag and cut tip of bag so it's easier to pipe dough into donut pan. This method keeps things cleaner.
Lastly, bake donuts in oven at 350 degrees F. for approximately 10 minutes. You'll know they're done when you press lightly on top of donut and it springs back nicely.
Once out of oven, allow donuts to cool down for a few minutes before trying to remove them out of the pan.
In a shallow dish, mix the sugar, cinnamon, and nutmeg together. To coat donuts, brush melted butter all over donut and roll around in sugar mixture. Tap off extra sugar. Enjoy!