In a medium bowl, add the flour, baking powder, baking soda, cinnamon and salt. Stir until combined.
In another medium bowl, whisk together apple cider, apple sauce, sugar, yogurt, oil and egg until combined.
Add wet mixture to flour mixture, and stir until just combined.
Spray two (6-cavity) donut pans with cooking spray. Spoon or pipe batter evenly into the 12 cavities.
Bake for 6-8 minutes, or until donuts spring back when lightly pressed. Cool in pan for 2 minutes. Invert donuts onto a wire rack.
While donuts are baking, mix together sugar and cinnamon in a shallow bowl.
Brush each donut with coconut oil on both sides and dip into the cinnamon sugar mixture to coat. Repeat until all donuts are coated.
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Notes
Donut pan needed: To get that classic donut shape you will need a donut pan. They are inexpensive and easy to find. I recommend the Wilton non-stick pans which you can grab online for less than $15.
Storage: These donuts taste best the day they are baked, but you can keep them in an airtight container at room temperature for 2 to 3 days.
Make ahead: If you want to prep ahead for brunch or the holidays, bake the donuts the day before and store them plain. Coat them in cinnamon sugar right before serving so they stay fresh and perfectly coated.