
In a frying pan with heated vegetable oil, fry the onion. Cut the champignons into quarters or thin slices, add to the onion and fry over medium heat, stirring constantly.

After 10 minutes, add salt to the mushrooms and onions and continue frying over moderate heat for another 10 minutes until cooked and the moisture has evaporated.

Transfer the mushroom and onion mixture into the ramekins, leaving 2-3cm of space at the edges for the sauce and cheese.

Prepare the sauce: fry the flour in a dry frying pan for 3-4 minutes, stirring constantly. When the flour turns light brown, add the sour cream and mix well to avoid lumps.

Pour warm filtered water into the pan and stir the sour cream mixture until smooth, bringing it to a boil over low heat.

Pour hot sour cream sauce over the mushroom and onion mixture and sprinkle each serving with cheese.

Place the filled molds in a preheated oven and bake for 15 minutes.