In a bowl, whisk the eggs with milk, add the melted butter, salt, and gradually whisk in the flour until a smooth semi-liquid batter without lumps is created.
Set aside and leave the batter to rest for at least 30 minutes.
Brush a non-stick pan with the oil. You don't need a large amount; just a little is enough.
Place the pan on the stove over medium heat. Allow the pan to heat sufficiently.
Remove the pan from the stove. Pour in some of the rested batter with a ladle. Let it spread evenly over the entire surface of the pan with a circular motion of the hand. Put the pan back on the stove.
Once the palačinka is firm and can be moved while you shake the pan, flip the palačinka carefully.
Fry the Czech crepe on the second side until slightly golden. It takes less time than to fry the first side – one minute, and you're done.