If you dont have any precooked chicken on hand. Heat skillet to very hot, with oil. Season chicken on both sides with salt and pepper. Cook until it's golden brown and cooked trough. Once chicken is cooked, dice into small cubes.
Rinse and drain peas and mushrooms under cold water.
Dice pickles into small cubes.
Saute sliced carrots and onion on a very hot skillet, until softened. Let sauteed ingredients cool to a room temperature. Mix all ingredients together.