Soak the buckwheat groats overnight, or for at least 6 hours. Then, rinse them very well and drain.
Transfer the soaked buckwheat groats to a blender or food processor, along with bananas, dates, chickpea flour, salt, and oil. Blend for a couple of minutes until very smooth and creamy.
Into a large mixing bowl, transfer the blended batter. Next, add the baking soda, lemon juice and mix for 1-2minutes until the bubbles disappear. Add in the blueberries and fold them gently into the mixture.
With a spoon, spread the buckwheat mixture into muffin forms. Then, add some blueberries on the top as well.
Into a preheated oven (175 C / 350F) insert the muffins and bake for around 20 minutes. For baking the muffins, I set my oven to ventilation mode combined with the up and down heating (10 minutes each mode).
Remove from the oven and place on a cooling rack for 10-20 minutes and then enjoy!