In a large bowl, whisk together the flour and salt, then add the eggs.
Gradually pour in the milk and sparkling water, whisking continuously until you have a smooth batter.
Let the batter rest for 15-20 minutes to allow the ingredients to combine well.
Lightly grease a skillet with oil and heat over medium heat.
Pour a ladleful of batter into the skillet and spread it evenly. Cook for 2-3 minutes, until the edges start to pull away from the pan, then flip and cook for another 1-2 minutes.
Repeat the process with the remaining batter, re-oiling the skillet occasionally.
For the filling, finely chop the onion and garlic. Sauté them in a pan with a little oil until translucent.
Slice the mushrooms, then add them to the onion and garlic. Cook over medium heat for 8-10 minutes, until the mushrooms soften and release their juices.
Add ground black pepper, then stir in the sour cream and cook for another 2-3 minutes.
Fill the prepared crepes with the cheesy mushroom mixture, then fold or roll them up.
Place the filled crepes in a baking dish, sprinkle with grated cheese, and bake at 350°F (180°C) for 10 minutes, until the cheese melts and is lightly browned.
Serve fresh, sprinkled with chopped parsley.
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