Preheat your oven to 180°C or 350°F fan setting. Grease a muffin tin or line the inserts with cupcake liners.
Blend the rolled oats until they become a rough flour mixture. Empty the oats into a medium-sized mixing bowl.
Blend the bananas with the coconut oil until smooth. Beat in the egg, add them all to the bowl of oats, stirring everything together.
Using an electric mixer, beat the 2 additional egg whites until stiff and frothy. This step is important for your muffins to rise a little.
Carefully fold the beaten egg whites into the mixture.
Finally, stir in your fresh blueberries.
You can now spoon your mixture into each of your cupcake liners until they’re almost level with the top.
Bake them on the middle shelf of the oven for 15-20 minutes until golden and a toothpick comes out clean.
Remove and allow to cool to room temperature before serving.