In a blender, combine the eggs, milk, flour, melted butter, sugar, salt, and orange zest (if desired). Blend until smooth.

Heat a non-stick skillet over medium heat. Pour about 1/4 cup of the batter onto the skillet and swirl it around to create a thin, even layer.

Let the crepe cook for about 1 minute, until the edges start to curl. Flip the crepe over and cook for another minute.

Transfer the crepe to a plate and repeat with the rest of the batter until you have a stack of crepes.