Beat the egg yolks in a bowl until frothy. First mix in the buttermilk, then the flour, baking soda and sugar. Do not work the dough too long (!) (But not too short either) - small lumps will later dissolve in the pan. Now add the melted butter. Beat the egg whites until stiff and fold into the batter.
Bake the pancakes in portions in a hot crepe pan (Teflon) made from about 80 ml of batter. As soon as bubbles form on the top and the underside is nicely browned, turn the pancakes and finish baking.
My recommendation: The pancakes can be served in many ways, e.g. with maple syrup and bacon, but also with fruit.