Preheat oven to 350 degree F (i.e. 180 degree Celsius). Mash the bananas in a bowl.
Now add coconut sugar, eggs, oil and vanilla extract. With a hand whisk, mix everything together till all the ingredients are completely blended. Wet ingredients mixture is ready.
Add oats flour, baking soda, baking powder, salt, ground cinnamon and ground nutmeg to the wet ingredient mixture.
Using a spatula, gently fold in the dry ingredients with the wet ingredients. Do not over-mix. Now add the blueberries to the muffin batter and gently fold everything again (do not over-mix).
Grease a standard muffin tin with oil. Scoop out 2-3 tablespoons of muffin batter and pour into greased muffin cups.
Bake the muffins in the oven for around 25-30 minutes or till the muffins are done (when the inserted toothpick in the muffin comes out clean).
Remove the muffins from the oven, and allow them to cool for 5-10 minutes.
The Healthy Banana Blueberry Oat Muffins are ready to be served warm, or these can be stored in an airtight container in the refrigerator for a week. You can also freeze the muffins in a freezer safe bag for upto 3 months.