Bliny with mushrooms (блины с грибами, Russian mushroom crêpes)

Instructions

1. Mix the flour, baking powder, sugar and salt. Add the eggs, then gradually the milk, to get a smooth, runny batter.
2. Stir in the melted butter and let the batter rest for 20 minutes.
3. Meanwhile, slice the onion and mushrooms. Cook the onion in the oil, then add the mushrooms and cook for 10 minutes until their liquid has evaporated.
4. Season the filling with salt, pepper and parsley.
5. Heat a lightly oiled non-stick pan and pour in a small ladleful of batter to form a thin disc.
6. Cook for 1 to 2 minutes per side until golden, then stack them somewhere warm.
7. Top each bliny with the mushrooms and a spoonful of sour cream, roll or fold it, and serve right away.