Preheat the oven to 220 degrees Celsius.
In a blender, combine all the wet ingredients plus the oats and blend until the oats are fine and blended well into the mixture. Let this sit for 15 - 20 minutes to allow the oats to absorb some of the moisture
Meanwhile put plain flour, baking soda, baking powder and salt in a bowl and mix well.
After 15 - 20 minutes the oat mixture should be the consistency of rice pudding. You can now add the dry ingredients and stir until just combined. It's ok for it to be a bit lumpy.
In the same bowl you had your dry ingredients in, add in 3/4 cup of frozen blueberries with 1 teaspoon of flour and mix so that the blueberries are lightly coated.
Add the blueberries into the muffin mixture and stir a few times. Do not overmix.
Distribute the mixture between 6 muffin cups in a greased muffin tray. You should make 6 large muffins. The muffin cups should be quite full.
Put in the oven for 5 minutes. Then reduce the temperature to 180 degrees Celsius and bake for another 20 minutes or until cooked through. The tops of the muffins should be golden brown (if you used honey) and puffed up quite high.
Allow to cool before transferring out of the muffin tray to cool. Allow to cool before serving.