01 -
In a large bowl, whisk together half of the milk as well as the eggs, sugar, salt, and flour. Add the vegetable oil and whisk again until well combined.
02 -
Gradually whisk in the remaining milk. If the batter is too thick (drips slowly from a spoon), add a little more milk or water. Let the batter stand for 10 minutes.
03 -
Meanwhile, in a frying pan, heat the oil over medium-low heat and fry the onion for 4-5 minutes, stirring regularly, until soft and translucent.
04 -
Add the chopped mushrooms and cook for another 8-10 minutes, stirring frequently. Season with salt and pepper, and any other spices to taste.
05 -
Transfer the mushroom mixture to a bowl and let it sit for a minute to cool slightly. Then stir in the sour cream and mix well.
06 -
Heat a lightly greased frying pan over low heat and pour in some batter to fry a thin pancake (like a crepe). Cook for about 3 minutes on low heat, then flip the pancake and cook for another minute, or until lightly browned. Transfer to a plate. Repeat with the remaining batter, stacking the pancakes on the plate.
07 -
To assemble the nalysnyky, place a pancake on a flat surface and spoon 2 tablespoons of the mushroom filling on one half. Roll or fold up the pancake in a way you like. You can tuck in the ends if you like. Repeat with the rest of the pancakes and filling.
08 -
Serve the mushroom nalysnyky warm or cold, with more sour cream and chopped herbs (such as parsley or dill) if desired.