Preheat oven to 400 degrees F. Spray a muffin tin with cooking spray or line with muffin liners.
Add all of the ingredients to a blender or food processor. Blend, or process, for about 1 minute, scraping down the sides of the processor as necessary. Batter will be somewhat smooth (some of the oats will break down and some will still be in small flakes).
Pour the batter into the muffin tin, filling each cup about ¾ full.
Bake for 16-17 minutes.
Let the muffins cool in the muffin tin for 10 minutes. Transfer muffins to a wire rack to cool completely.