Preheat oven to 350 degrees F. If using a silicon donut pan, no greasing is needed. If using a metal donut pan, grease with coconut oil, grass-fed butter or another neutral fat. No donut pan? Grease a muffin tin or cupcake tin and make those!
Place all ingredients in a high speed blender or food processor and puree until completely smooth, scraping down sides as needed. Pour batter into donut pan, filling 3/4 full. If using only 1 6-hole donut pan, you will have batter left. You can either bake another batch after the first have been cooled and removed, or you can make 2 cupcakes or muffins.
Bake for 18 minutes or until a toothpick comes out clean. When donuts are finished baking, immediately sprinkle half of the maple sugar on top. Place remaining maple sugar on a small plate. Cool 10 minutes, remove donuts from pan and press other side into the maple sugar.