Yes, crepe batter can be made ahead of time. In fact, resting the batter in the refrigerator for at least 30 minutes, or even overnight, is highly recommended for a smoother texture.
Making crepe batter ahead of time offers several advantages. When the batter is first mixed, the gluten in the flour is activated, which can result in tougher crepes. Resting the batter allows the gluten to relax, leading to more tender crepes. Additionally, resting allows the flour to fully absorb the liquid, resulting in a smoother batter with fewer lumps. This hydration process ensures a more even cooking and a delicate texture. For best results, whisk the batter again before cooking to redistribute any settled flour. You can store crepe batter in the refrigerator for up to 48 hours.
Before cooking, check the consistency of your rested crepe batter. If it seems too thick, add a tablespoon or two of milk until it reaches a thin, pourable consistency similar to heavy cream. This will ensure your crepes are thin and delicate.