Preheat oven 325 F. Prepare a donut baking pan with cooking spray.
To a blender or food processor, add all ingredients layering the dry ingredients first, then the chickpeas, then the liquid.
Blend on high until a smooth batter appears. Add blueberries to blender and fold by hand. Fill the donut cavities with the batter, filling until flush.
Bake 12-13 minutes until donuts are slightly browned around the edges. Remove from the oven and cool 2-3 minutes before flipping the donut tin upside down onto a cooking rack. The donuts should easily slide out. Cool donuts another 15 minutes on the wire rack prior to enjoying.
Keep donuts in refrigerator to maintain freshness up to 7 days.
Notes
Be sure you scrape down the sides of the food processor as you blend the batter to avoid clumps and get smooth donuts.
Let the batter set for about 5 minutes to give the oat flour time to absorb more of the moisture to ensure tender donuts.
Layer the ingredients starting with the dry ingredients first, then the chickpeas, and then the liquids. This order helps ensure the batter is clump-free and smooth.