Make the dough with milk, flour, egg, melted butter, sugar and a pinch of salt.
Mix all the ingredients well with the whisk to mix them and leave to rest in the fridge for at least half an hour.

Put a small amount of dough into a rather small pan, more or less half a cooking spoon can be fine.
Make circular movements with the pan so that the dough adheres in the same quantity to the entire surface up to the sides.
When the sides start to get crisp and detach laterally, turn your crepe.
It is not necessary to grease the pan to cook the cracks because the butter contained in the dough is sufficient.