Warm the milk until lukewarm, then crumble in the yeast and add one teaspoon of sugar. Let it stand for 5-10 minutes, until foamy.
In a large bowl, whisk together the flour, brown sugar, remaining granulated sugar, and a pinch of salt. Crack in the eggs, and mix in the proofed yeast mixture.
Slowly incorporate the melted butter, then add the club soda. Mix until smooth, creating a light and airy batter.
Cover the batter with a clean kitchen towel and let it rise in a warm place for 45 minutes, or until doubled in size.
Preheat the waffle iron and grease it with butter. Pour in a portion of batter, and cook until golden brown and crispy, about 3-4 minutes.
Meanwhile, prepare the salted caramel sauce: melt the salted butter caramel with the heavy cream in a small saucepan, stirring constantly until smooth and glossy.
Drizzle the freshly baked waffles with the warm salted caramel sauce, then sprinkle with sea salt flakes and chopped walnuts.
Dust with powdered sugar and serve immediately.
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