Cook's Illustrated. "Try to choose 10- to 12-ounce split chicken breasts with skin intact. If split breasts are of different sizes, check the smaller ones a few minutes early to see if they are cooking more quickly, and remove them from the skillet if they are done ahead. Brown ale gives this sauce a nutty, toasty, bittersweet flavor. Newcastle Brown Ale and Samuel Smith Nut Brown Ale are good choices."