Pound chicken breasts to 1/4-inch thickness on a chopping board.
Flour, salt, and pepper on a shallow dish; stir with a fork.
Medium-high heat oil in a big skillet. Once the oil is hot, dredge chicken cutlets in seasoned flour.
Fry the cutlets till golden, 5 minutes per side. If pieces don't fit, cook in batches.
Layer the chicken on a wide dish to keep it warm.
After 1 minute, reduce the heat to medium and sauté the prosciutto.
5 minutes are needed to brown and dry the mushrooms. Salinize.
Heat the Marsala to remove the alcohol.
Simmer the sauce for a minute with chicken stock.
Reheat the chicken in butter. Warm for 1 minute.
Serve with parsley, salt, and pepper. Enjoy!