Melt the butter over low heat, then let it cool for a few minutes.
In a large bowl, whisk together the flour, baking powder, granulated sugar, vanilla sugar, ground cinnamon, and a pinch of salt until well combined.
In another bowl, whisk the eggs, then add the milk and melted butter. Mix well.
Pour the wet ingredients into the dry ingredients and stir until just combined to form a smooth batter.
Preheat your waffle maker and lightly grease it with butter or oil to prevent sticking.
Pour a portion of the batter into the waffle maker and cook for 3-5 minutes, or until golden brown and crispy.
Cut the cooked waffles into smaller donut-shaped pieces, or use a cookie cutter to create small circular shapes.
In a deep pot, heat the vegetable oil to medium heat.
Fry the waffle donuts in the hot oil for 1-2 minutes, or until crispy and golden brown.
Place the fried donuts on a paper towel-lined plate to drain excess oil.
While still warm, toss the donuts in a mixture of powdered sugar and ground cinnamon to coat.
Melt the dark chocolate over a double boiler or on low heat, then drizzle it over the waffle donuts.
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