In a blender, blend banana, milk, vanilla and sugar on high until completely smooth.
In a large bowl, whisk oat flour and baking powder together then pour the wet mixture into the bowl and stir to combine well. Now gently fold in the blueberries.
Add the batter into a muffin pan filling each about ¾ way to the top. Garnish with oats if you'd like.
Bake for about 22-24 minutes. Allow to cool for a bit before removing from the pan.
Serve fresh and enjoy!
Notes
Store in an air-tight container for about 3 days.
Use parchment muffin tins, lightly grease muffin tin or use a non-stick muffin tin which is what I did