1 - Place all ingredients in order as listed in a blender and blitz until smooth, about 1 minute. Scrape the sides and blend again briefly until batter is lump free. Refrigerate at least 1 hour, but 2 is ideal.
2 - Place nonstick or cast iron skillet over medium-to-medium high heat to preheat. Melt a little butter or oil in the bottom of the pan and swirl to coat. With the hot skillet in one hand and the batter in the other, slowly and steadily pour crepe batter into the center of the pan, tilting the skillet around to spread the batter evenly across the bottom in a very thin layer. It takes some practice but after 3 or 4 times, you can get consistently even crepes.
3 - After 10-15 seconds, the crepe batter shouldn't look shiny anymore, it should appear more matte and the bottom should be lightly browned. So, flip it over and cook another 10 seconds or so. Remove from pan and repeat this process until no more batter remains.
4 - Pile the crepes into a pie plate covered with some foil throughout the cooking process to keep them all warm. Serve immediately with whatever toppings you desire.
Note: The medium-to-medium high heat is an approximation because all stovetops are different. If your crepes are cooking in about 30 seconds total, you are at the right temperature.