Put eggs and milk in a bowl. Whisk together with an electric mixer (or use a stand mixer). Mix flour, sugar, baking powder, and vanilla sugar together in a bowl. Add the dry ingredients to the milk/egg mixture sifted through a sieve. Mix everything well together. Finally, add the melted butter to the batter. Heat a pan with butter and cook fine, thin pancakes. Serve the pancakes with diced fresh, ripe nectarines and a good vanilla ice cream.