That's what I was going to say:
Season chicken with seasoning salt and italian herbs, cook in pan, remove and keep warm.
Saute onions, mushrooms and garlic until tender, and moisture is released and evaporated. Add in a mix of 1/2 chicken broth and 1/2 dry marsala (or red wine or sherry if you don't have marsala), simmer until reduced by at least half. Add in chicken, cover to coat.
To make a creamy version, you can mix in a splash of cream just before adding chicken. If you have any fresh parsley, sprinkle over the chicken and mushrooms and serve.