In a large mixing bowl, sift together the flour, baking powder, salt, sugar, and cocoa powder to ensure a lump-free and light batter.
In a separate bowl, whisk the eggs, then add the milk, sparkling water, and vanilla extract. Mix until smooth.
Melt the butter, let it cool slightly, and then whisk it into the egg mixture.
Slowly pour the wet ingredients into the dry ingredients, whisking constantly to create a smooth, lump-free batter.
Add 30 g of ground hazelnuts to the batter and mix until evenly distributed.
Lightly grease a skillet with oil and heat over medium heat.
Pour a small ladle of batter onto the hot skillet, spreading it out in a circular motion. Cook for 1-2 minutes, until the edges set and bubbles start to form on the surface.
Carefully flip the pancake with a spatula and cook for another minute, until golden brown.
Repeat the process until all the batter is used. If necessary, re-grease the skillet with a little oil between batches.
Serve the chocolate hazelnut pancakes drizzled with melted dark chocolate and sprinkled with the remaining ground hazelnuts.
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