From America's Test Kitchen
A crêpe is nothing but a thin pancake cooked quickly on each side and wrapped around a sweet or savory filling, but it has a reputation for being difficult. We wanted an easy method for crêpes that were thin and delicate yet rich and flavorfully browned in spots. Finding the perfect ratio of milk to flour and sugar gave us rich-tasting, lightly sweet pancakes. We were surprised to find that neither the type of flour nor the mixing method seemed to matter, and a plain old 12-inch nonstick skillet worked as well as a specialty crêpe pan. What does matter is heating the pan properly (over low heat for at least 10 minutes), using the right amount of batter (we settled on 1/4 cup), and flipping the crêpe at precisely the right moment, when the edges appear dry, matte, and lacy.
Crêpes will give off steam as they cook, but if at any point the skillet begins to smoke, remove it from the heat immediately and turn down the heat. Stacking the crêpes on a wire rack allows excess steam to escape so they won’t stick together. To allow for practice, the recipe yields 10 crêpes; only eight are needed for the filling.