Preheat the oven to 350 degrees. Prepare a mini muffin pan by coating with cooking spray or melted butter.
In a large bowl combine flour, baking powder, two teaspoons cinnamon and one cup of sugar, then mix until combined.
Add the apple cider, milk, beaten egg and vanilla to the dry ingredients. Mix and stir until fully combined into a batter.
Use a small cookie scoop to fill each section of the mini muffin pan about 3/4 full.
Bake for 8-10 minutes or until cooked all the way through. Use the toothpick test to make sure the batter is cooked through in the center. Remove doughnut holes from pan and let cool for a few minutes.
Mix together 1/3 cup white granulated sugar and two teaspoon cinnamon. Dip each doughnut hole in melted butter coating the outside, then roll each doughnut in cinnamon sugar. Repeat for all doughnuts then enjoy!