In a shallow bowl, combine flour, Italian seasoning, parsley, salt, and pepper
Dredge chicken breasts in flour combination
Heat oil in a large skillet over medium-high heat until it sizzles
Add chicken breasts, and cook 3-5 minutes on each side until golden brown
Remove chicken from skillet
Add onion, and saute, stirring occasionally until onions begin to soften
Add mushrooms, and continue cooking another 2 minutes
Remove onions and mushrooms and add wine
Simmer wine 3-5 minutes, and stir from the bottom to remove stuck bits from the pan
Add chicken back to skillet, and top with onions and mushrooms
Cover, and simmer 10-15 minutes
Serve over rice or fettuccine