Mix flour, sugar, salt, baking powder, and vanilla sugar in a bowl.

In another bowl, whisk together milk and eggs before adding them to the flour mixture.

Melt the butter in a small pan and then whisk the melted butter into the pancake batter.

Cook the pancakes over medium heat.

Pour about 1 dl of batter onto the pan and wait to flip the pancake until the batter starts to bubble. Cook the other side for about 1 minute.

Keep the pancakes warm under a piece of aluminum foil until serving.