Finely chop the onion, grate the carrot and fry in a small amount of vegetable oil.
Finely chop the mushrooms and fry them separately from the onion in vegetable oil, add salt.
Cut the chicken into small cubes like prunes. Grate the potatoes and egg on a fine grater. Drain the excess liquid from the corn.
Assemble the salad in layers: first, the chicken breast, smear with mayonnaise.
Next, potatoes-mushrooms-onions with carrots and smear with mayonnaise.
Then corn-prunes and egg.