Prepare the batter:
Preheat the oven to 350°F and grease two 6-count donut pans with nonstick spray.
In a large bowl, whisk together the oat flour, almond flour, baking powder, pumpkin pie spice, cinnamon, nutmeg, and salt.
In a separate bowl, whisk together the canned pumpkin, eggs, almond milk, maple syrup, and vanilla extract until well combined.
Add the wet ingredients to the dry ingredients and mix gently until just combined. Be careful not to over-mix the batter.
Fill the donut pans:
Spoon the batter into a pastry bag or ziplock bag and snip off the corner. Pipe the batter into the donut wells, filling them evenly. This recipe makes exactly 12 donuts.
Bake the donuts:
Bake the donuts for 12 to 13 minutes, or until golden and a toothpick inserted into the center comes out clean. Keep an eye on them to avoid over-baking, as donuts can bake quickly.
Transfer the donuts to a wire rack and let them cool completely.
Prepare the cinnamon-sugar coating:
While the donuts are cooling, melt the coconut oil (or butter) in a small bowl. In a separate shallow bowl, mix together the cinnamon and cane sugar.
Once the donuts have cooled, use a pastry brush to coat each donut with melted coconut oil, then toss them in the cinnamon-sugar mixture, making sure to coat both sides.
Serve and enjoy:
Once the donuts are coated in cinnamon-sugar, they’re ready to be enjoyed! These donuts make a great breakfast or a sweet snack any time of the day.