While the sauce is cooking, pour two liters of water into a saucepan, add 2 teaspoons of salt, bring to a boil. Put pasta or horns in boiling water and cook until almost ready. Put the boiled pasta in a colander. Back to the sauce. Remove the sauce from the heat, add sour cream and mushroom sauce, half of the grated cheese, sprinkle the other half with powdered powder on top. Mix everything well so that the consistency of the sauce becomes viscous.