Preheat your oven to 350 degrees, and arrange the oven rack in the center position. Lightly grease a 6 cavity donut pan (can use something larger, but this recipe will only fill 6 large donuts) with non-stick spray. Set aside.
In a large bowl, combine the flours, cinnamon, baking soda, and sea salt. Mix well.
In a smaller bowl, whisk together eggs, applesauce, vanilla extract, and maple syrup. Add the wet ingredients to dry, and continue to stir with a wooden spoon until well combined and no flour pockets remain.
Spoon the batter into your donut pan, filling each cavity to the top. Transfer to the oven and bake for 16-18 minutes (depending on oven). Remove and set aside to cool for a few minutes.
While donuts are cooling, prepare the topping. Mix together the sugar and cinnamon. Lightly brush each donut with coconut oil, and dip each end of the donuts in the cinnamon/sugar mixture. Place on parchment paper.
Enjoy warm, or store in an airtight container for up to 3 days.