Combine all ingredients in a food processor or blender, except for mix-ins. Blend until smooth, less than a minute.
Stir in remaining mix-ins. (Stir mix-ins right into batter in blender to save a dish!)
Pour or scoop batter into a sprayed muffin tin. (I use a ¼-cup ice cream scoop to make portioning easier.) Sprinkle on rolled oats as a topping, if desired.
Bake for 18-20 minutes, until golden brown.
Allow to cool for 15 minutes before removing from muffin tin and enjoying!
Lasts 5 days stored in an airtight container in the fridge.