Sure. If you don't have Marsala wine, you can use a dry sherry or a combination of white wine and brandy as a substitute. If alcohol is a concern, most of the alcohol is cooked out in the pan so you just get the added flavor and the sauce ends up with an insignificant amount of alcohol. If you are looking for alcohol-free, you could just use more broth and boil that down. However, the flavor will be slightly different.