Pre-heat oven to 425 degrees Fahrenheit; spray 2 donut pans with non-stick cooking spray
Shred the zucchini using a grater
In a large mixing bowl add all three ingredients; mix well with a whisk
Spoon mixture into each donut well to fill about 2/3 full. If desired use a ziplock bag (cut corner) to make a piping bag.
Bake donuts for about 7-9 minutes at 425 degrees Fahrenheit
6. Remove from pan and let cool
If glaze desired, while donuts cooling, mix glaze ingredients together. Dip each donut top into the glaze until top is well covered.
Let glaze dry (typically takes about 30-60 minutes) and store in airtight container.