Preheat oven to 350F. Grease a donut pan and set aside. Be generous in coating the pan so that the donuts do not stick!
Whisk the dry ingredients together in a medium bowl.
Beat together the wet ingredients in a large bowl.
Add the flour mixture to the wet ingredients and stir to combine. Spoon batter into a piping bag (see below if you don't have a piping bag)
Pipe batter into the doughnut pan. You may have extra batter and need to bake in batches.
Bake the donuts in a preheated oven for 10-12 minutes until a toothpick comes out clean and the tops spring back when touched. They won't necessarily be golden brown since we aren't frying them.
While donuts back, make the cinnamon sugar topping and pour into a large plastic bag.
Let cool for 10 minutes in the pan. Use a wire rack to flip the donuts out.
Toss donuts in cinnamon sugar mixture. If the mixture is not sticking, you can lightly brush the donuts with coconut oil. Place coated donuts on a cooling rack.