Melt the butter over low heat, then let it cool for a few minutes.
In a large bowl, whisk together the flour, baking powder, sugar, vanilla sugar, and a pinch of salt until well combined.
In another bowl, whisk the eggs, then add the milk, melted butter, and half of the chestnut purée. Mix until smooth.
Pour the wet ingredients into the dry ingredients and mix until just combined, creating a smooth batter.
Preheat your waffle iron and lightly grease it with butter or oil to prevent sticking.
Pour a portion of the batter onto the waffle iron and cook for 3-5 minutes, or until golden brown and crispy.
Repeat the cooking process with the remaining batter, and keep the waffles warm until serving.
For the whipped cream, whip the heavy cream with the powdered sugar until stiff peaks form.
Melt the dark chocolate over a double boiler or on low heat, then drizzle it over the waffles.
When serving, top the waffles with the remaining chestnut purée, add a dollop of whipped cream, and drizzle with the melted chocolate.
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