1 - Preheat the oven to 180°C (350 °F).
2 - In a saucepan, melt the 6 tablespoons of butter over low heat.
3 - Break the 2 eggs into a large bowl and add the melted butter. Beat with a whisk.
4 - Add the flour, powdered sugar, vanilla sugar, baking powder and salt. Whisk together.
5 - Butter and flour a madeleine baking pan using a half tablespoon of butter and 1 tablespoon of flour.
6 - Fill each cavity three quarters full.
7 - Bake for 20 minutes.