Do not cook the chicken in the oil until it is crispy. It's better to undercook the chicken in the oil because it will continue cooking in the sauce. Caution: when adding the Marsala on high heat it will flame up, which is good because it is burning off the alcohol. Therefore, do not add the Marsala wine without the heat because you want the alcohol to burn off. When slicing the mushrooms, slice so that each slice is showing its stem, keeping the mushroom shape. Do not chop the mushrooms. Make sure to cook on high heat so that all the sauces blend together.