Combine milk, buckwheat flour, eggs, and salt in a high-powered blender. Blend on high speed until smooth, about 30 seconds.
Heat a 10” frying pan over medium-high heat or preheat your crepe maker.
Frying Pan Method: Just before adding batter, spray the hot frying pan with non-stick cooking spray. Repeat between each crepe to prevent sticking.
Lift the pan off the heat, tilt it, and pour in about 1/3 cup of batter. Rotate the pan quickly to spread the batter into a thin, even circle about 8” in diameter.
Place the pan back on the heat and cook for 1-2 minutes until the edges are set and slightly lifted.
Gently flip the crepe with a silicone spatula and cook the other side for 1-2 minutes until set. Repeat with remaining batter.
Crepe Maker Method: If using a crepe maker, follow its specific instructions. This method creates thinner crepes.
Place cooked crepes on a plate. Serve immediately or stack with parchment paper between them for later.