I found this recipe for chicken marsala from Cook's Illustrated a few years back. Over the years, I've made some adjustments. I think I've got it down to just about perfect now. If you like a thicker sauce, mix a a couple of teaspoons of cornstarch with cold water, and add that to the sauce after you melt in the butter. Serve atop a bed of fettucine, with a side of fresh sauteed green beans. Absolutely delicious! Recipe can easily be halved by just using 2 chicken breasts instead of 4. I'd reccomend using the same amount of sauce though. Enjoy!