Melt butter, and set aside to cool
Whisk milk and eggs together until smooth
Whisk milk and egg mixture into flour until smooth, but for no more than 1 minute
Add butter to mixture
Set batter aside for a minimum of 15 minutes, up to a full day; we shoot for 30 minutes
Heat a large nonstick skillet over medium heat until evenly heated (don't worry about overheating your nonstick pan at this temp, it will be fine)
Brush a very small amount of butter into the pan just to get it primed for the first crepe
Pour ~1/3 cup of batter into your pan, and tilt pan to evenly distribute batter in a thin layer
After ~30 seconds, flip and cook on other side for ~10 seconds until both sides are barely starting to brown
Remove from pan and set aside on plate while finishing your batch; Because the thermal mass of the crepes are so low, we strongly suggest preheating the plate you will be stacking them on
If filling, stack flat on plate
If covering in sauce, fold into quarters and stack