Preheat the oven to 350°F and spray donut pans with nonstick cooking spray.
nonstick cooking spray
Combine the flour, baking powder, salt and cinnamon in a medium bowl.
2 cups all-purpose flour, 1 ½ teaspoons baking powder, 1 ½ teaspoons salt, 1 teaspoon cinnamon
In a large bowl combine the pumpkin puree, brown sugar, oil, and eggs.
1 (15 ounce) can of pumpkin puree, 1 cup brown sugar, ¼ cup canola or vegetable oil, 2 eggs
Add the pumpkin mixture to the flour mixture and mix until just combined.
Divide the batter between the donut wells and smooth the tops with your finger, the back of a spoon, or a small rubber spatula.
Bake for 13–16 minutes, or until the donuts spring back when lightly touched.
Cool in the pan for 5 minutes then transfer to a wire rack to cool completely before icing.
Combine ¼ cup + 2 tablespoons of the maple syrup, melted butter, vanilla, powdered sugar and pinch of salt in medium bowl, adding the last 1 or 2 tablespoons of maple syrup, if necessary, to make the icing the desired consistency.
¼ cup + 2-4 tablespoons pure maple syrup, 3 tablespoons melted butter, ½ teaspoon vanilla, 1 ½ cups sifted powdered sugar, pinch of salt
Dip the top of each donut in the icing and let the excess fall off. Set the donut on a wire rack, icing side up and give it a little shake to spread the icing out evenly.