Beat the butter with sugar and a pinch of salt until frothy. Add the eggs one at a time and stir in each egg for about half a minute until creamy.
Mix flour with baking powder. Stir into the dough together with the yoghurt and milk until no more lumps can be seen. Refine the dough with cinnamon or vanilla, if you like.
Bake the dough in portions in the greased waffle iron to make waffles and enjoy warm.