Before going to bed, rinse the buckwheat groats well and put them to soak in about 3 cups of water. Cover.
The next morning, drain and rinse well. Place in the bowl of your high-power blender with all the other ingredients. Blend on high speed for one minute, until you reach a uniform and creamy texture.
Heat a non-stick pan on medium-high heat and pour a portion of batter in the center. Tip the pan to spread the batter evenly: the crepes should be thick enough to hold their shape when flipped, but no too thick either. If you want, sprinkle a few chia seeds on top. When the top of the pancake is no longer liquid, carefully flip it with a spatula. Cook for another one or two minutes.
Place in a plate and put in the oven on very low temperature. Repeat until all the pancakes are done.