Prepare the soup. Add the potatoes to the boiling water, add salt and leave to cook. While the potatoes are cooking, heat a frying pan with vegetable oil, fry the carrots and onions in it for 8 minutes. Finely chop the washed mushrooms, add them to the frying pan, simmer for 20 minutes. Add cream to the frying pan, stir and turn off the heat. Add the fried vegetables to the soup, add salt and pepper. Simmer under the lid for 10 minutes.